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:
[84.142, -99.804]

Ex Output:
-7.831


Ex Input:
[246.744, 206.484, 194.841]

Ex Output:
216.023


Ex Input:
[37.529, -27.613, -39.996, -21.265, -87.647]

Ex Output:

-27.798