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.

Ex Input:
[-40.246, -7.512, 174.245, -98.6]

Ex Output:
6.972


Ex Input:
[245.091, 201.984, 204.428, 222.046, 4.807, 21.497, -34.025, 160.097]

Ex Output:
128.241


Ex Input:
[198.273, -2.503, 217.698, -50.731, -55.456, 158.491, -46.404, -82.953, 68.62]

Ex Output:

45.004