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: [17.32, -99.392, -94.299, 120.34, -8.171, 90.241, 231.79, 44.711]

37.817