Solution:Exam statistics

Create a file called Exam.pyand add the code bellow:

grades = [100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5]

def print_grades(grades):
    for grade in grades:
        print grade

def grades_sum(grades):
    total = 0
    for grade in grades:
        total += grade
    return total

def grades_average(grades):
    sum_of_grades = grades_sum(grades)
    average = sum_of_grades / float(len(grades))
    return average

def grades_variance(scores):
    average=grades_average(scores)
    variance=0
    for score in scores:
        add=(average-score)**2
        variance += add
    var_tot=variance/len(scores)
    return var_tot

def grades_std_deviation(variance):
    return variance**0.5

variance=grades_variance(grades)

print print_grades(grades)
print grades_sum(grades)
print grades_average(grades)
print grades_variance(grades)
print grades_std_deviation(variance)

The execution of the Exam.pyfile should be :

root@erlerobot:~/Python_files# python Exam.py
100
100
90
40
80
100
85
70
90
65
90
85
50.5
None
1045.5
80.4230769231
334.071005917
18.2776094147
root@erlerobot:~/Python_files#