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: [-61.892, 158.927, 7.47, 211.832, 156.964, 50.793, 86.636, 33.142, 151.127, 117.796]

91.28