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: [102.115, 237.034, 176.879, 29.401, -85.078, 225.883, 106.49, 242.128, 40.775, -18.185]

105.744