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: [-23.79, -14.831, 56.809, -41.071, 220.937, -87.035, 116.879, -22.936, 39.804, 96.279]

34.105