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]: [99.278, 72.353, -21.292]
[EX A]: 50.113

[EX Q]: [242.148, 97.472, -15.031, 246.784, 54.233, -27.114]
[EX A]: 99.749

[EX Q]: [84.867, 7.92, 65.639, -58.685, 70.945]
[EX A]:
34.137