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:
[116.074, 213.452, 86.981]

Ex Output:
138.836


Ex Input:
[-24.857, -28.799, 240.99]

Ex Output:
62.445


Ex Input:
[246.704, -84.038, 215.262, 146.579]

Ex Output:

131.127