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: [220.205, -41.977, 36.28, 99.386, -53.347, 109.005, 244.313, 168.351, 148.904, -22.678]

90.844