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: [61.911, -99.08, 3.512, -69.373, 240.562, 221.108, 43.672, 200.51]

75.353