Question

Use python

For this program, you will create a grade curving program by reading grades from a file, calculating the mean and standard deviation. The mean is the average value of the grades and the standard deviation measures the spread or dispersal of the numbers from the mean. Given data X1, X2, X3.Xo then X1 + x2 + x3 + ... + xn Mean (m) n Standard Deviation (sd) = (x1 - m)2 + (x2 - m)2 + (x3 - m)2 + ... + (xn-m)2 n - 1 In the above and remaining formulas (m) will always represent the mean and (sd) will always represent the standard deviation. Student grades are stored in a file named grades_<section number.txt. The program should read the filename input and calculate the mean, standard deviation and then apply the curve to all the grades, which should be printed to the screen formatted as shown in the example. You have two sample files grades_1H1.txt and grades_101.txt. Assignment: 1. You are to design your program based on the following hierarchical chart or VTOC table: 2. The purpose of the getFile() function is to prompt the user for the filename which contains the grades and return it to main(). 3. The purpose of the getData() function is to read the file grade data into a list and return the list to main(). This function should receive the filename as an argument.

Start:

def main():
gradeList = []
  
fileName = getFile()
gradeList = getData(fileName)
mean = calculateMean(gradeList)
sd = calculateSD(mean, gradeList)
displayHeadings(gradeList, mean, sd)
curveGrades(mean, sd, gradeList)
  
  
if __name__ == "__main__":
main()

Answer 1

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Python Script to copy:

# Python script to assign letter grade for given grade

import math # To use sqrt function

# Function to get filename from user

def getFile():

filename = input("Enter the filename: ")

return filename

# Function to read data from input file

def getData(filename):

fin = open(filename, "r") # Open the input file

line = fin.readline() # Read the first line in file

grades = [] # Initializing list to store grades in input file

while line != "":

grades.append(float(line.strip())) # Adding every grade value to list

line = fin.readline() # Read the next line in file

return grades

# Function to calculate Mean for given data

def calculateMean(gradeList):

total = 0

for each in gradeList:

total += float(each)

mean = total / len(gradeList)

return mean;

# Function to calculate standard deviation for given data

def calculateSD(mean, gradeList):

total = 0

for i in gradeList:

total += (float(i) - mean)**2 # ** indicates value to the power i.e, x*x

stdev = total / (len(gradeList)-1)

return math.sqrt(stdev);

# Function to display titles or headings of output data

def displayHeadings(gradeList, mean, sd):

print("Number of grades: ",len(gradeList))

print("Mean: ",mean)

print("Standard Deviation: ",'{:.4f}'.format(sd))

print("\n\t",'{:7s}'.format("Score Grade"))

# Function to assign letter grade for respective grade

def curveGrades(mean, sd, gradeList):

slno = 1 # Variable to represent serial number

for grade in gradeList:

# Calculate the letter grade

if grade >= (mean + 1.5*sd):

letterGrade = 'A'

elif grade >= (mean + 0.5*sd) and grade < (mean + 1.5*sd):

letterGrade = 'B'

elif grade >= (mean - 0.5*sd) and grade < (mean + 0.5*sd):

letterGrade = 'C'

elif grade >= (mean - 1.5*sd) and grade < (mean - 0.5*sd):

letterGrade = 'D'

elif grade < (mean - 1.5*sd):

letterGrade = 'F'

print('{:2d}'.format(slno),'{:7.2f}'.format(grade),letterGrade.rjust(3," "))

slno += 1 # Incrementing serial number

# Main function to test all functions above

def main():

gradeList = []

fileName = getFile()

gradeList = getData(fileName)

mean = calculateMean(gradeList)

sd = calculateSD(mean, gradeList)

displayHeadings(gradeList, mean, sd)

curveGrades(mean, sd, gradeList)

if __name__ == "__main__":

main()

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Python script screenshots:

1 2 # Python script to assign letter grade for given grade import math # To use sqrt function 3 4 5 # Function to get filename from user def getFile(): filename = input("Enter the filename: ") return filename 6 7 8 9 # Function to read data from input file def getData(filename): fin = open(filename, "r") # Open the input file line fin.readline() # Read the first line in file grades = [] # Initializing list to store grades in input file while line != "": grades.append(float(line.strip)) # Adding every grade value to list line = fin.readline() # Read the next line in file return grades 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 # Function to calculate Mean for given data def calculateMean(gradeList): total = 0 for each in gradeList: total += float(each) mean = total / len(gradeList) return mean;

27 28 29 30 # Function to calculate standard deviation for given data def calculateSD (mean, gradeList): total = 0 for i in gradeList: total += (float(i) - mean)**2 # ** indicates value to the power i.e, x*x stdev = total / (len (gradeList)-1) return math.sqrt(stdev); # Function to display titles or headings of output data def displayHeadings (gradeList, mean, sd): print("Number of grades: ", len(gradeList)) print("Mean: ", mean) print("Standard Deviation: ",'{:.4f}'.format(sd)) print("\n\t",'{:75}'.format("Score Grade")) 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 = 'A' # Function to assign letter grade for respective grade def curveGrades (mean, sd, gradelist): sino = 1 # Variable to represent serial number for grade in gradeList: # Calculate the letter grade if grade >= (mean + 1.5*sd): letterGrade elif grade >= (mean + 0.5*sd) and grade < (mean + 1.5*sd): letterGrade elif grade >= (mean - 0.5*sd) and grade < (mean + 0.5*sd): letterGrade = 'C' elif grade >= (mean 1.5*sd) and grade < (mean - 0.5*sd): letterGrade = 'D' elif grade < (mean 1.5*sd): letterGrade = 'F' = 'B'

print('{:2d}'.format(slno), '{:7.2f}'.format(grade), letterGrade.rjust(3," ")) slno += 1 # Incrementing serial number 58 59 60 61 62 63 64 # Main function to test all functions above def main(): gradeList = [] fileName = getFile() gradeList = getData(fileName) calculateMean (gradeList) sd = calculateSD (mean, gradeList) displayHeadings (gradeList, mean, sd) curveGrades (mean, sd, gradeList) 65 66 67 68 69 70 71 72 73 mean = '_main_": if name main()

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Sample Input:

File name: input.txt

input.txt 1 2 3 4 5 6 7 8 9 10 11 12 13 59 60 65 75 56 80 66 62 88 72 85 71 63 77 65 77 65 50 45 62 14 15 16 17 18 19 20 21

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Sample Output:

Enter the filename: input.txt Number of grades: grades: 20 Mean: 67.15 Standard Deviation: 11.0610 1 2 3 4 5 6 7 9 10 11 12 13 14 15 16 17 18 19 20 Score Grade 59.00 D 60.00 D 65.00 C 75.00 B 56.00 D 80.00 B 66.00 C 62.00 C 88.00 А 72.00 C 85.00 A 71.00 C 63.00 C 77.00 B 65.00 C 77.00 B 65.00 C 50.00 F 45.00 F 62.00 C

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Hope it will helpfull and do comments for any additional info if needed. Thankyou

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