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: [244.454, -60.861, 12.995, 143.486, 203.163, 215.813, 72.241, 102.645]

116.742