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: [-99.248, 168.832, 98.054, -32.987, 42.078, 88.896, 65.633]

47.323