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]: [226.383, 37.978, 174.444, 117.212]
[EX A]: 139.004

[EX Q]: [-66.387, 135.639, 182.921, 175.573, 105.67, -29.751, 156.67, 83.119, 19.538]
[EX A]: 84.777

[EX Q]: [248.93, 60.189]
[EX A]:
154.56