Standard Deviation - Classroom.py

grades = []
ind = raw_input("Enter the number of students in the class: ")
print ("\n")
strength = int(ind)
for i in range (0, strength):
	inp = raw_input("Enter score of student " + str(i+1) + ": ")
	z = int(inp)
	grades.append(z)

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:
        variance+=(average-score)**2
    c = variance/float(len(scores))
    return c

def grades_std_deviation(variance):
    return variance ** 0.5

print ("\n")
print_grades(grades)
print ("\nSum of Scores: "), grades_sum(grades)
print ("\nAverage Score: "), grades_average(grades)
print ("\nVariance: "), grades_variance(grades)
print ("\nStandard Deviation: "), grades_std_deviation(grades_variance(grades))
x = raw_input("\n\nPress any key to exit.")