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.

[82.439, -85.167, 100.665, -83.297]
3.66

[-78.906, 119.863, 44.561, 1.523]
21.76

[-48.267, 51.601, 187.641, 143.454, 222.746, 147.612, 39.615]

106.343

