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]: [21.659, 63.646, -97.361]
[EX A]: -4.019

[EX Q]: [-57.334, 24.995, 72.22, -78.376, 218.297, 203.999, 21.93, -20.246, 15.97]
[EX A]: 44.606

[EX Q]: [101.752, -1.441, -81.705, -93.019, 62.029]
[EX A]:
-2.477