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: [126.199, 150.268, 51.786, -84.338, 103.884, -75.673, 51.738, 147.685, 246.451, 79.241]

79.724