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: [29.833, 170.246, 222.43, -87.927, -70.09, 8.335, 90.479, -22.306]

42.625