0918. Grasshopper - Array Mean

Find Mean

Find the mean (average) of a list of numbers in an array.

Information

To find the mean (average) of a set of numbers add all of the numbers together and divide by the number of values in the list.

For an example list of 1, 3, 5, 7

1. Add all of the numbers

1+3+5+7 = 16

1. Divide by the number of values in the list. In this example there are 4 numbers in the list.

16/4 = 4

1. The mean (or average) of this list is 4

Solution:

def get_sum(func):
    def wrapper(nums):
        return func(sum(nums), len(nums))
    return wrapper

@get_sum
def find_average(sum, count):
    return sum / count if count else 0