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: [33.377, -91.899, 38.653, 191.655, 45.296, 125.377, 47.769, 53.938, -18.513, -45.174]

38.048