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: [236.145, 2.261, -65.81, 165.401, 176.736, 199.472, 37.829, 141.305, 207.147]

122.276