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: [145.466, 191.693, -37.663, 231.965, 175.925, 212.885, 241.65, -1.828, -87.743]

119.15