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: [-74.059, 235.755, -22.903, -14.89, -10.372, 236.559, 172.373, -58.796, 160.052, 203.936]

82.766