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: [-91.322, 112.331, 179.888, -42.366, 92.384, 96.908, 78.247, 243.896]

83.746