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:
[181.256, -78.191, 162.427, -90.527, 123.709, 248.073]

Ex Output:
91.124


Ex Input:
[-86.423, 157.154, 69.563, -67.516, 147.66, 216.018, 213.404]

Ex Output:
92.837


Ex Input:
[27.286, -49.795, -30.643, 30.334, 12.307]

Ex Output:

-2.102