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: [32.313, 91.775, 123.32, 237.186, 168.309, 156.228, -29.149, 144.075, 164.301, 175.043]

126.34