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.

[-96.182, -37.177, 130.645, -44.92, -12.78, 90.335, -99.791, -11.926, 217.275]
15.053

[150.321, 169.658, 221.448, 54.785, 160.245, 9.534, 78.865, 229.753, 225.969]
144.509

[-65.735, 193.914, 49.387, -18.48, 189.403]

69.698