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]: [169.421, 88.16]
[EX A]: 128.791

[EX Q]: [165.242, 50.738, -34.087, 77.742, -21.241, -4.541]
[EX A]: 38.976

[EX Q]: [120.236, 116.311, -13.268]
[EX A]:
74.426