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: [40.841, 43.656, 169.652, 216.532, -15.841, 16.685, -15.805, -91.177, 98.947, -68.002]

39.549