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: [151.852, 1.029, -20.728, -50.593, -94.863, 1.227, 38.469]

3.77