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: [73.765, 158.89, 18.469, 92.029, -0.516, 128.997, 202.802, 3.991, 6.347, 201.252]

88.603