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: [66.612, 66.507, 215.587, 188.831, -74.681, 223.979, 148.364, 28.922]

108.015