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: [109.113, 221.094, -2.767, 126.055, -4.845, -16.356, 221.354, 17.508, -33.086, 132.051]

77.012