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]: [245.466, 19.262, 199.878]
[EX A]: 154.869

[EX Q]: [-57.148, -59.655, 208.462, 223.004, 100.684, 188.569]
[EX A]: 100.653

[EX Q]: [-76.49, -78.756, 153.971, 188.474, 249.513]
[EX A]:
87.342