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]: [199.153, 182.13, -7.832, -60.259]
[EX A]: 78.298

[EX Q]: [165.647, 110.893, -83.152, -56.699, 19.53, 48.825, -64.043, 199.192, 249.46, 244.789]
[EX A]: 83.444

[EX Q]: [-15.578, -71.684, 218.783]
[EX A]:
43.84