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:
[215.561, -18.128]

Ex Output:
98.716


Ex Input:
[84.091, 17.564, 58.169, 6.482, 53.256, 216.444, 171.489]

Ex Output:
86.785


Ex Input:
[195.568, 224.242, -3.128, -94.397, 145.86]

Ex Output:

93.629