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: [-94.678, 157.073, -42.503, 158.208, -66.687, 218.141, -38.499, 149.969]

55.128