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: [24.178, -12.985, -38.013, 103.784, 74.878, -82.984, 34.121, 26.287]

16.158