Question B1 a. With the aid of a well-labelled diagram, describe the 3-tier architecture of the web. [6 marks] b. Give an example of a Uniform Resource Locator and clearly identify all its five (5) components. [5 marks] C. Create a Mongoose Schema (Code) named studentSchema with the following details. i. Lastname, string, required ii. Firstname, string, required iii. Gender, string, default Female iv. StudentID, string, required [4 marks] d. Create a Student model (Code) from the schema created in (c) and make it available for use in other files. [5 marks] code that e. Assume that the needed fields are found in the req.body from ExpressJS, write destructures the req.body object and uses the data to create an instance of a Student. [5 marks]
Answers
Three-tier architecture of the web: In a web-based application architecture, a three-tier architecture is a client-server software application architecture model in which the user interface, functional process logic, and data storage and access are developed and managed as autonomous modules on distinct platforms.
The following are the three tiers of the 3-tier architecture of the web:
Presentation tier: It is also known as the user interface (UI) layer. This layer is responsible for receiving user input and presenting the output to the user in a format that is easy to read and understand.
Application tier: It is also known as the logic layer. This layer is responsible for processing and manipulating data, as well as implementing application logic.
Data tier: It is also known as the storage layer. This layer is responsible for storing data, which is used by the application. It may include a database server, a file server, or a content management system (CMS).
b. Example of a Uniform Resource Locator and its five components:
An example of a Uniform Resource Locator (URL) is: https://brainly.com/question/17683332
The five components of the above URL are as follows:
Scheme: https
Authority: brainly.com
Path: /question/17683332
Query: Not applicable
Fragment: Not applicable
c. Code for creating a Mongoose Schema named studentSchema:
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var studentSchema = new Schema({lastname: {type: String, required: true},firstname: {type: String, required: true},gender: {type: String, default: 'Female'},studentID: {type: String, required: true}});
d. Code for creating a Student model from the schema created in (c) and making it available for use in other files:
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var studentSchema = require('./studentSchema.js');
var Student = mongoose.model('Student', studentSchema);
module.exports = Student;
e. Code for destructuring the req.body object and using the data to create an instance of a Student:
const {lastname, firstname, gender = "Female", studentID} = req.body;const newStudent = new Student({lastname, firstname, gender, studentID});
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Related Questions
if an algorithm takes n^2 operations, and the computer can perform 100 billion operations per second, what is a reasonable estimate of how long it will take to sort 2 billion elements (assuming there is ample memory, the computer doesn't crash, etc.)?
Answers
An estimate of how long it will take to sort 2 billion elements using this algorithm is 0.04 seconds. However, it is important to note that this is an estimate and actual performance may vary depending on other factors such as memory usage and system conditions.
An algorithm is a set of instructions that tells a computer how to perform a specific task. If an algorithm takes n^2 operations, it means that the number of operations it takes increases with the square of the size of the input. For example, if the input size is 2 billion, the algorithm will take (2 billion)^2 operations. If the computer can perform 100 billion operations per second, it will take (2 billion)^2 / (100 billion) seconds to sort 2 billion elements using this algorithm.
If an algorithm takes n² operations and the computer can perform 100 billion operations per second, it will take (2 billion)² / (100 billion) seconds to sort 2 billion elements.
To simplify the calculation, we can square 2 billion which is 4 trillion, then divide it by 100 billion, which gives:
4 trillion / 100 billion = 0.04 seconds.
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true or false a rootkit is a type of malware that modifies or replaces one or more existing programs to hide the fact that the computer has been compromised
Answers
The statement is true. A rootkit is a type of malware that alters or replaces existing programs to conceal the presence of malicious activities and maintain unauthorized access to a compromised computer system.
A malicious software programme called a rootkit is made to take control of a computer system and grant users privileged access. It alters or replaces vital system files, programmes, or utilities at a deep level, frequently within the operating system. By doing this, it can prevent antivirus software and other security measures from detecting its presence and its activity. Attackers frequently employ rootkits to keep hold of compromised computers for extended periods of time, steal sensitive data, or engage in unauthorised actions without being noticed by the system or its users.
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What makes a sequence of database operations a transaction? All database operations must either complete in its entirety or have no effect Atomicity, Consistency, Isolation, Durability All results must conform to existing constraints in the database Database operations cannot be transactions
Answers
Answer:
All database operations must either complete in its entirety or have no effect Atomicity, Consistency, Isolation, Durability
Explanation:
A database transaction must be atomic in the sense that it must either be complete in its entirety or would have no effect. Consistent-it should be by conforming to the constraints that are found in the database. Isolated - in the sense that it must not be seen to affect other transactions. Durable – there must be possibility for it to be written to a storage that is persistent.
The sequence of the database operations is made as a transaction as all the database operations must either complete in its entirety or have no effect Atomicity, Consistency, Isolation, Durability.
What is database transaction?The database transaction must fulfill all four characters, that is must be atomic- it should be complete within itself; it should be consistent- conforming to the existing database; it should have isolation- not affecting other transactions; and should have durability- for longer storage.
Therefore, option A. is correct.
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Sophie used the software development life cycle to write a new program. Sophie planned her program using pseudocode and then wrote her actual code. Which stage of the software development life cycle is Sophie ready for next?
Answers
The stage of the software development life cycle that Sophie is ready for next is Building (software development)
What Is the Software Development Life Cycle?Software Development Life Cycle is known to be a kind of application of laid down business practices to create software applications.
It is said to be divided into;
Planning RequirementsDesign BuildDocument Test DeployMaintain.Learn more about software development from
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Answer:
Testing
Explanation:
I did it on my test!
according to the data sheet, the maximum data transfer rate of this drive is 2,370 mbps. what is the average number of sectors per track of the drive?
Answers
Since we only know the data transfer rate, we cannot find the number of sectors per track of the drive also because one logical track is no longer the same as a physical track, and even small hard drives have caches.
What is known as the data transfer rate?
The amount of digital information transferred from one location to another in a predetermined amount of time is known as the data transfer rate (DTR). The data transfer rate can be thought of as the rate at which a certain amount of data moves from one location to another. In general, the data transfer rate increases with the bandwidth of a particular path.
A data transfer rate indicates how much digital information can move swiftly between two locations, for as from a hard drive to a USB flash drive. You'll see it measured in, somewhat perplexingly, bits per second and bytes per second.
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Mandy is writing a paragraph about her favorite basketball team. She wants to explain that the team is so successful because the players work together. What would be the best type of evidence to illustrate Mandy’s proposed topic? a few examples of how the players successfully scored points a brief history of the game of basketball a quotation from the coach about the players a comparison of current players with past successful members of the team
Answers
Answer:
A ) a few examples of how the players successfully scored points
edge 2021 :)
Answer: (A)
Explanation: Just got it right.
I really need help please :)
Answers
Question For Brainly
Is deletion of a question I answered affects my points and score?
Answers
Answer:
Yes, the deletion of a question that you answered can affect your points and score on Brainly. When you answer a question on Brainly, you earn points and your score increases. However, if the question is later deleted by the asker or by the moderators, the points you earned from answering that question will be deducted from your account and your score will decrease accordingly. It's important to note that if the deletion is due to a violation of Brainly's Community Guidelines, your account may also be subject to additional penalties or restrictions.
Question 2 16 pts Suppose D; is the treatment dummy and {Yoi.Y₁) are the potential outcomes. Denote the observed outcome as Y₁ =Yoi + Di *(Y1i-Yoi). Define the causal effect as the average treatment effect E(Y₁i-Yoi). Suppose we collect an i.i.d. observational data set {Y₁, D₁, i = 1,...,n}. (1) If we find evidence that Y; and D; are independent, does it imply D; has no causal effect on Y; ? Briefly explain. (2) If we find evidence that Y; and D; are correlated, does it imply D; has a causal effect on Y; ? Briefly explain. Now suppose we collect another data set {Yj, Dj, j = 1,...,m} from a randomized controlled experiment. (3) If we find evidence that Y; and D; are independent, does it imply D; has no causal effect on Y; ? Briefly explain. (4) If we find evidence that Y; and D; are correlated, does it imply D; has a causal effect on Y; ? Briefly explain.
Answers
(1) No, independence between Y₁ and D₁ does not imply that D₁ has no causal effect on Y₁ (2) No, the correlation between Y₁ and D₁ does not imply a causal effect. (3) Yes, if Y₁ and D₁ are independent in a randomized controlled experiment, it implies no causal effect. (4) No, the correlation between Y₁ and D₁ in a randomized controlled experiment does not imply a causal effect.
If evidence suggests that Y₁ and D₁ are independent in an observational dataset, it does not imply that D₁ has no causal effect on Y₁. Independence between Y₁ and D₁ only indicates that there is no systematic relationship between the treatment assignment and the potential outcomes. However, there could still be confounding variables or unobserved factors influencing both the treatment assignment and the outcome, which could introduce bias and affect the causal relationship. Thus, further analysis or the application of causal inference methods is necessary to assess the true causal effect of D₁ on Y₁. In a randomized controlled experiment, if evidence shows that Y₁ and D₁ are independent, it provides strong evidence that the treatment assignment was successfully randomized and uncorrelated with the potential outcomes. This strengthens the argument for a causal interpretation, as any observed differences in Y₁ between the treatment and control groups are more likely attributable to the causal effect of D₁.
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A post made to your favorite social media application 5 years ago can add information to your digital footprint.
Answers
Answer:
True
Explanation:
Anything you search, or post, etc, is added to your digital footprint.
what is estimated time enroute? multiple choice the time remaining before reaching a destination using the present speed and is typically used for navigation applications the time of day of an expected arrival at a certain destination and is typically used for navigation applications a device that measures the acceleration (the rate of change of velocity) of an item and is used to track truck speeds or taxicab speeds a gps technology adventure game that posts the longitude and latitude location for an item on the internet for users to find
Answers
Estimated time enroute is the time remaining before reaching a destination using the present speed and is typically used for navigation applications. Option A.
Estimated Time Enroute (ETE) is a common navigation term that refers to the estimated time it will take to reach a destination based on the current speed of travel.
It is typically used in navigation applications such as GPS systems, aircraft navigation systems, and maritime navigation systems. ETE is calculated by taking the remaining distance to the destination and dividing it by the current speed.
This calculation assumes that the current speed will remain constant throughout the journey, which is not always the case. ETE is useful for travelers to estimate arrival times and make necessary adjustments to their plans.
By knowing the ETE, travelers can also adjust their speed or take alternative routes to reach their destination on time.
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Define a method printall() for class petdata that prints output as follows with inputs "fluffy", 5, and 4444. Hint: make use of the base class' printall() method.
Answers
The base class' printall() method.
What is printall()?
A built-in Python function called printall() outputs all of its parameters to the console. It's a good idea to utilise this to rapidly print all all arguments that are supplied to the programme. Given that it can display each of the arguments on a single line, it is very useful when debugging programmes that accept many arguments. It is especially helpful when publishing data that has been organised into a table or list. It works with the both texts and numbers and accepts unlimited number of arguments. It also has the ability to print objects together with the properties that go with them. Printall() can be utilized to rapidly and easily debug code, present data more logically, or debug programmes.
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Encryption can be applied on a file, a folder, or an enitre hard disk and provide a strong level of protection.
a. true
b. false
Answers
The given statement "Encryption can be applied on a file, a folder, or an entire hard disk and provide a strong level of protection" is true.
Encrypting File System provides an added layer of protection by encrypting files or folders on various versions of the Microsoft Windows OS. EFS is a functionality of New Technology File System (NTFS) and is built into a device via the OS. It facilitates file or directory encryption and decryption with the help of complex cryptographic algorithms.
Encryption can be used to protect all of the above by using a secure algorithm to scramble data into an unreadable format. Files, folders, and hard disks can all be encrypted to prevent unauthorized access.
Therefore, the given statement is true.
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https://www.bing.com/videos/search?q=dancing+aaron+smith+1+hour&view=detail&mid=C6C28AF3C0CEC1E4AEE3C6C28AF3C0CEC1E4AEE3&FORM=VIRE
enjoy.
Answers
Answer:
Interesting
Explanation:
Dancing???
Write an SQL statement to show the sum of SubTotal for each customer. List CustomerID, LastName, FirstName, Phone, and the calculated result. Name the sum of SubTotal as SumOfSubTotal and sort the results by CustomerID, in descending order.
Answers
An SQL statement to show the sum of SubTotal for each customer Using the SELECT Statement in SQL. The SQL "SELECT" declaration is the expression used to retrieve facts from the database.
What is an instance of an SQL declaration?An SQL SELECT declaration retrieves information from a database desk in line with clauses (for instance, FROM and WHERE ) that designate criteria.
SELECT column1, column2 FROM table1, table2 WHERE column2='value';Start your question with the choose declaration. choose [all | distinct] . Add area names you need to display. field1 [,field2, 3, 4, etc.] ... Add your declaration clause(s) or choice criteria. Required: ... Review your chosen declaration. Here's a pattern declarationYou can retrieve facts from simply one desk or several. To get started, it is satisfactory to retrieve facts from one desk and discover ways to be a part of tables later.Read more about the SQL statement :
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question 2 you want to create a vector with the values 43, 56, 12 in that exact order. after specifying the variable, what r code chunk allows you to create this vector?
Answers
Since you want to create a vector with the values 43, 56, 12 in that exact order. After specifying the variable, the R code chunk that allows you to create this vector is option A: c(43, 56, 12)
What exactly is a R code chunk?A runnable section of R code is known as a code chunk. Calculations will be repeated if the document is produced again. Because there is less chance of a mismatch between comments in a paper and the results being addressed, code chunk technology is advantageous.
Therefore, in regards to the question above, a vector with the values 43, 56, and 12 will be created by the code chunk c(43, 56, 12). In R, a vector is a collection of identically typed data components that are kept in a sequential order. By adding the desired values inside the parenthesis of the combine function, you may generate a vector.
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See full question below
You want to create a vector with the values 43, 56, 12 in that exact order. After specifying the variable, what R code chunk allows you to create this vector?
Single Choice Question. Please Choose The Correct Option ✔
A
c(43, 56, 12)
B
v(43, 56, 12)
C
c(12, 56, 43)
D
v(12, 56, 43)
What is/are the correct increasing order of downlink of satellite bands? Select one or more: □ a. L < Ku
Answers
The correct increasing order of downlink satellite bands is - L < S < C < Ku < Ka (Option B).
How is this so?It is to be noted that the order of downlink satellite bands is based on their frequencies,with lower frequencies being assigned to longer wavelengths.
In this case, L-band has lower frequency thanS -band, C-band has lower frequency than both L-band and S-band, and so on, resulting in the order L < S < C < Ku < Ka.
The downlink satellite bands,in increasing order of frequency are:
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HERES A RIDDLE!!
What is more useful when it’s broken??
Answers
Answer:
an egg
Explanation:
Some of you may be familiar with the “butterfly effect”. The phrase refers to the idea that a butterfly’s wings might create tiny changes in the atmosphere that may ultimately alter the path of a tornado, or cause one to happen in the first place.
A butterfly effect in social media can be anything; a small tweet or a Whatapp message that is retweeted, shared, liked and spread to millions within just a few hours.
Social media is the “butterfly” of modern times. Do you agree with the statement or not. Mention real life examples and events to support your point of view.
Answers
Yes, I agree with the statement that social media is the "butterfly" of modern times, as it can have significant impacts and ripple effects similar to the butterfly effect. Social media platforms have the power to amplify and disseminate information rapidly, reaching millions of people within a short span of time. This can lead to real-life consequences and shape events in various ways.
One real-life example is the Arab Spring uprising in 2010-2011. Social media played a crucial role in organizing and mobilizing protests across multiple countries in the Middle East and North Africa. A single post or video shared on social media platforms sparked widespread demonstrations, leading to political changes and societal shifts in the region.
Another example is the #MeToo movement, which gained momentum through social media platforms. It started with a single tweet by actress Alyssa Milano and quickly spread, encouraging millions of individuals to share their experiences of sexual harassment and assault. The movement had a profound impact on public awareness, legal reforms, and societal conversations about gender equality.
These examples illustrate how social media acts as a catalyst, magnifying the reach and impact of individual actions and messages. Like the butterfly effect, seemingly small actions on social media can lead to significant and far-reaching consequences in the real world.
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Which type of input devices used in big hero 6 movie
Answers
The Input Devices Used in Movie Big Hero are:
A joystick medical robot Armored exoskeleton Jet-boots.What are input device?This is known to be a is a piece of instrument that helps gives or provide data to any information processing system.
Note that the Input Devices Used in Movie Big Hero “6” are a medical robot made by by Tadashi Hamada., Armored exoskeleton and others.
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when using load-balancing mode, one server is assigned as the active server that provides dhcp services to clients while the other server is placed in standby mode.
T
F
Answers
This statement is true. When load-balancing is used, one server is designated as the active server that handles DHCP requests from clients, while the other server is in standby mode, ready to take over if the active server fails.
One server is assigned as the active server that provides DHCP (Dynamic Host Configuration Protocol) services to clients, while the other server is placed in standby mode.
This configuration ensures that the active server efficiently handles client requests while the standby server is ready to take over in case the active server fails or becomes overwhelmed.
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In aircraft data transmission, there are 2 types of signal propagation. a) Define uplink and downlink messages? b) Between an uplink and downlink transmission, which one requires higher power ? Explain the reason for your answer c) What happened to the receiver circuit when the system is in transmission mode ? Explain your answer d) When transmitting in uplink or downlink, what kind of memo is displayed in case of communication loss between aircraft and ground?
Answers
Uplink messages: This refers to the transmission of data from an aircraft to the ground station or base station. Downlink messages: This refers to the transmission of data from a ground station or base station to an aircraft.
a) In aircraft data transmission, there are two types of signal propagation, namely uplink and downlink messages:
These messages are typically used for sending navigational or location data, communication between the pilot and ground station, and so on. Downlink messages: This refers to the transmission of data from a ground station or base station to an aircraft. This data typically includes flight information, updates on weather conditions, air traffic control instructions, and so on.
b) Between an uplink and downlink transmission, the uplink transmission typically requires higher power as it requires the aircraft to send data to the ground station or base station. The reason for this is that the aircraft is typically farther away from the ground station or base station, so more power is needed to transmit the data over the longer distance.
c)When the system is in transmission mode, the receiver circuit is turned off. This is because the receiver circuit is designed to receive data and is not capable of transmitting data. When the transmitter circuit is turned on, it sends data to the ground station or base station, while the receiver circuit is turned off to avoid any interference or signal loss due to the transmission.
d) In case of communication loss between the aircraft and the ground station or base station during uplink or downlink transmission, a memo is displayed on the aircraft's screen indicating the loss of communication. This memo may include instructions on what to do next or may simply inform the pilot that communication has been lost. In some cases, the memo may also include information on how to troubleshoot the communication issue.
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In which order do the problem solving steps happen?
*
A) Try, Define, Prepare, and Reflect
B) Reflect, Prepare, Try, and Define
C) Define, Prepare, Try and Reflect
D) Reflect, Try, Prepare, Define
Answers
Answer:c
Explanation:
Select the correct location on the image.
Which snippet of code is in XML?
This is a title
Paragraph 1 text italics
cob
<>point 1
point 2
Artist Pink Floyd
***
hi:(
p:{
font-family:ariel;
size: 30;
}
size: 10;
color: red;
ondick="document.
getElementById(demo).
innerHTML-Date()">
Click me to display Date and Time.
Answers
Answer:
4
Explanation:
1 - html, 2 - css, 3 - ..., 4 - xml
When using word, on which tab would you find the word count tool
A) home tab
B) insert tab
C) backstage view
D) review tab
Answers
Answer:
your answer is d. review tab becoz it comes under the proofing group and the proofing group is found in the review tab
On the cities worksheet, click cell f4 and enter a formula that will subtract the departure date (b1) form the return date (b2) and then multiply the result by car rental per day value (f3)
Answers
Excel functions usually begin with the equal to sign, "=", Hence, the excel formula which does the calculation stated above is =(B2 - B1)*F3
The operation in the bracket is performed first, which uses the subtraction operation to deduct the departure date from the return date.The result of the bracketed operation is then multiplied by the number of car rentals per day, f3.Hence, the required function is =(B2 - B1)*F3
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1} What are ways in which computer programs can be improved for efficiency?
A) Avoiding recognizing patterns
B) Breaking a problem down into smaller steps and recognizing relevant patterns
C) Writing functions in programs in large chunks, rather than as independent parts
D) Writing functions that can only be used to solve one problem
2} Which of the following would be an optimal data structure for storing a text information?
A) Dictionary
B) Integer
C) List
D) String
3} What data type is best suited to store the length of a string?
A) Boolean
B) Integer
C) List
D) String
4} Which of the following are best commenting practices?
A) Identify all of the output statements.
B) State the obvious.
C) Use block comments for long comments.
D) Use triple quotes to comment.
Answers
Answer: 1. B) Breaking a problem down into smaller steps and recognizing relevant patterns
2. D) String
3. B) Integer
4. D) Use triple quotes to comment.
Explanation:
. ____ is the set of rules that allow an agent to interpret the meaning of those expressions or sentences.
a. Grammar b. Syntax c. Semanticsd. Logic
Answers
c.Semantics is the set of rules that allow an agent to interpret the meaning of those expressions or sentences.
Semantics involves the development of rules and techniques for representing the meaning of words and sentences in a way that can be understood by computers. This includes techniques for identifying synonyms, antonyms, and other relationships between words, as well as developing algorithms for analyzing the structure of sentences and identifying the relationships between words within them.
Semantics is important for allowing computer agents to interpret and understand natural language text. By developing a set of rules and techniques for interpreting the meaning of expressions or sentences, computer agents can analyze and make decisions based on the content of text in a way that is similar to human understanding.
So the correct answer is c.Semantics.
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____________________ is the measure of how quickly a font can be read
Answers
Readability is the measure of how quickly a font can be read. Readability is an important consideration when selecting a font for use in printed materials, such as books, magazines, and newspapers, as well as digital media, such as websites and mobile apps.
Several factors can impact readability, including font size, line spacing, and character spacing. Fonts that are too small or too tightly spaced can be difficult to read, while fonts that are too large or too widely spaced can be distracting. Additionally, fonts that use unusual or complex letter shapes can be more difficult to read than more traditional fonts.
Another important consideration for readability is the contrast between the font and the background. A font that is too light or too similar in color to the background can be difficult to read, while a font that is too dark or too contrasting can be harsh on the eyes.
Overall, readability is an important consideration for designers and publishers who want to ensure that their content is accessible and easy to read. By selecting fonts that are clear, legible, and appropriately sized and spaced, designers can help to improve the readability of their materials and make them more engaging and accessible to a wider audience.
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Write a program that reads student scores, gets the best
score, and then assigns grades based on the following scheme:
Grade is A if score is >= best -10;
Grade is B if score is >= best -20;
Grade is C if score is >= best -30;
Grade is D if score is >= best -40;
Grade is F otherwise.
Answers
You can run this program by copying and pasting it into a Python file and then running the file using a Python interpreter. When prompted, enter the number of students and their scores, and the program will output the grades for each student based on the given scheme.
A possible solution in Python:
```
# Define a function to read scores and calculate grades
def assign_grades():
# Read the number of students and their scores
num_students = int(input("Enter the number of students: "))
scores = []
for i in range(num_students):
score = int(input("Enter the score for student {}: ".format(i+1)))
scores.append(score)
# Get the best score
best_score = max(scores)
# Assign grades based on the scheme
grades = []
for score in scores:
if score >= best_score - 10:
grades.append("A")
elif score >= best_score - 20:
grades.append("B")
elif score >= best_score - 30:
grades.append("C")
elif score >= best_score - 40:
grades.append("D")
else:
grades.append("F")
# Print the grades for each student
for i in range(num_students):
print("Student {}: Score={}, Grade={}".format(i+1, scores[i], grades[i]))
# Call the function to test it
assign_grades()
```
This program defines a function called `assign_grades()` that reads the number of students and their scores from the user, calculates the best score, assigns grades based on the given scheme, and prints the grades for each student. The function uses lists to store the scores and grades for each student, and loops over these lists to calculate the grades based on the best score. Finally, the function prints the grades for each student using formatted strings.
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