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:
[-46.113, 125.487, 133.801, 230.957, 217.606, 147.203, -27.73, 66.455, -96.494]

Ex Output:
83.464


Ex Input:
[-17.026, 165.89]

Ex Output:
74.432


Ex Input:
[91.594, -42.447, 221.845, 129.556, 34.139, -39.215, -68.586]

Ex Output:

46.698