Definition: In this task you will be given a list of numbers and you need to find the mean (average) of that list. The mean of a list can be found by summing every number in the list then dividing the result by the size of that list. The output should be rounded to 3 decimal places.
Input: [26.831, 39.528, 94.579, -30.43, 226.299, -24.453, -59.32]

39.005