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]: [108.26, -20.681, 127.479, -29.352]
[EX A]: 46.426

[EX Q]: [-28.295, -24.828, -66.96, -12.108, -96.597, 110.99, 172.86, -18.752, 157.717]
[EX A]: 21.559

[EX Q]: [238.923, 74.8, 61.228, 127.613]
[EX A]:
125.641