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: [151.554, 128.642, 208.429, 238.617, 3.405, 227.536, -77.163, -75.497, 95.605, 2.315]

90.344