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: [-66.768, 102.414, 16.822, 237.427, 202.346, 28.853, 210.711, -11.824, -63.676, 242.05]

89.836