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: [-97.19, 171.569, 228.163, 183.696, -98.925, -42.398, 227.564, 219.719]

99.025