Review


#1



https://www.codecademy.com/courses/python-intermediate-en-7mgOa/2/3?curriculum_id=4f89dab3d788890003000096

Ive been getting a headache with this for ages... it just gives me the same issue every time.


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)
    averag = sum_of_grades / float(len(grades))
    return averag

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

def grades_std_deviation(variance):
    return variance ** 0.5
    variance = grades_variance(grades)
    print grades_std_deviation(variance)
    
    
      
print print_grades(grades)
print grades_sum(grades)
print grades_average(grades)
print grades_variance(grades)
print grades_std_deviation(grades)

I get this from the console

50.5
None
1045.5
80.4230769231
334.071005917
Traceback (most recent call last):
  File "python", line 38, in <module>
  File "python", line 28, in grades_std_deviation
TypeError: unsupported operand type(s) for ** or pow(): 'list' and 'float'

#2

Have you checked this yet:


#3

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