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: [225.225, 136.237, 86.8, 66.145, 204.966, 11.107, 236.475, 1.077]

121.004