9/9 help!


#1
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:
        variance += (average - score) ** 2
    variance /= float(len(scores))
    return variance

def grades_std_deviation(variance):
    return variance ** 0.5

variance = grades_variance(grades)

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

What's wrong with this code? Everything lines up... Right?


#2

Instead of print grades should be print print_grades(grades)
You need to call function print_grades(grades) and print the result


#3

the last lines of code

variance = grades_variance(grades)

print_grades(grades)  // here's the call to the existing function that prints all grades
print grades_sum(grades)
print grades_average(grades)
print variance
print grades_std_deviation(variance)

#4
    print print_grades(grades)
    print grades_sum(grades)
    print grades_average(grades)
    print grades_variance(grades)
    print grades_std_deviation(variance)

print print_grades(grades) NOT print grades


#5

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:
square_diff = (average - score) ** 2
variance += square_diff
total_variance = variance / len(scores)
return total_variance

print grades_variance(grades)

def grades_std_deviation(variance):
variance = variance ** 0.5
return variance

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