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: [199.168, -13.333, 11.955, 127.827, 101.541, -23.333, 170.279, 29.964, -94.554, 158.28]

66.779