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: [187.518, 218.708, -97.132, -6.462, 201.972, 44.28, 137.253, 109.548]

99.461