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: [-42.791, 57.161, 67.729, 9.2, 0.749, 14.042, 79.452, 65.156, 89.3, 34.715]

37.471