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: [21.785, 214.08, -11.675, -22.846, -85.067, 144.987, -87.181, -1.324, 244.769, 41.187]

45.872