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]: [207.449, 85.584, -55.048, -10.53, 30.755]
[EX A]: 51.642

[EX Q]: [-55.198, 36.097, 190.132]
[EX A]: 57.01

[EX Q]: [220.14, 5.173, -78.832, 132.403]
[EX A]:
69.721