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: [196.727, -10.045, 149.394, 143.787, 197.396, 141.845, 63.379, -51.565]

103.865