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]: [-20.155, -42.404]
[EX A]: -31.28

[EX Q]: [-3.281, 84.204, -74.415, 151.616, 14.048, -98.313, 95.625, -79.981]
[EX A]: 11.188

[EX Q]: [249.263, -2.203, 181.958, 4.546]
[EX A]:
108.391