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: [153.935, -40.313, 62.549, 104.111, -87.696, 83.206, 18.682, -82.708, 241.124, -28.375]

42.451