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: [232.312, -91.217, 80.736, 1.007, -88.542, 82.515, 215.274, -86.326, 150.463, -87.969]

40.825