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]: [138.526, 60.81, 233.845, -33.602, 189.784, 13.888, 184.543, 53.635, 18.299, -87.132]
[EX A]: 77.26

[EX Q]: [159.381, -84.046]
[EX A]: 37.668

[EX Q]: [84.541, -70.824, -9.953, 64.465, 208.875, 25.429, 81.195, 22.43, 87.39]
[EX A]:
54.839