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 Q]: [65.591, -56.104, -28.389, -22.521]
[EX A]: -10.356

[EX Q]: [153.482, 150.917]
[EX A]: 152.2

[EX Q]: [54.117, 52.533, -86.276]
[EX A]:
6.791