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: [-50.44, -13.21, 117.874, 68.855, 166.922, 238.014, 191.515, -87.913]

78.952