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: [61.713, 142.67, 27.139, 128.056, -90.127, 37.108, 87.502, -91.403, 20.742, 90.148]

41.355