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]: [217.978, 70.977, 31.129, -87.408, -99.013, 249.862, -87.151, 207.527, 43.432]
[EX A]: 60.815

[EX Q]: [225.697, 75.029]
[EX A]: 150.363

[EX Q]: [155.039, 103.423, -32.087, 77.721]
[EX A]:
76.024

