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: [-7.972, -81.063, 170.32, -72.689, -67.825, -60.014, 181.593, 40.943, -66.977, 164.934]

20.125