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: [-43.113, 194.708, 21.635, 233.98, 232.055, -76.464, 48.366, 28.033, -54.157, 246.767]

83.181