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: [-38.265, 153.05, 57.987, 121.07, 212.804, -70.335, 234.799, 174.937, -75.684, 28.975]

79.934