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]: [199.874, -45.634, -39.343, 75.985, 143.35, 87.15, 120.645, -34.636, 159.567]
[EX A]: 74.106

[EX Q]: [215.854, -43.532, 51.416]
[EX A]: 74.579

[EX Q]: [125.332, 80.443]
[EX A]:
102.887