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.

[139.608, 17.516, 100.5, -51.362, 57.462, -77.569, -95.41, -24.339, -96.579]
-3.353

[-3.281, 84.204, -74.415, 151.616, 14.048, -98.313, 95.625, -79.981]
11.188

[-53.613, 187.943, 232.251, 102.786, 86.448, 70.668, 70.52, 60.698]

94.713