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.

[-4.749, 102.787, -45.229, 184.111, 221.888, 22.727, 20.887, 34.094]
67.065

[245.2, 202.565]
223.882

[-80.848, 234.827, -60.819, -66.838, 192.396, 191.16]

68.313