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]: [127.703, -82.203, 53.438]
[EX A]: 32.979

[EX Q]: [9.392, -80.549]
[EX A]: -35.579

[EX Q]: [81.412, 169.404, 122.98, -21.127]
[EX A]:
88.167