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: [-51.339, -51.33, 148.948, -78.562, 0.245, 225.421, 57.88, -79.052, -9.079, 164.313]

32.745