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: [162.385, 90.784, 137.875, 141.499, 179.335, 174.937, -63.078, 225.585, -16.753, -27.884]

100.469