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: [187.908, -10.534, -70.911, -26.095, 56.286, 93.628, -99.012, 157.864]

36.142