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: [231.852, 41.261, -53.891, 137.105, 12.72, 180.338, 159.849, 242.602, -3.445, 70.085]

101.848