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: [-0.982, 43.502, 158.917, 211.201, -51.77, -52.54, -78.002, 51.215, 150.942]

48.054