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]: [74.601, 131.018, -45.91]
[EX A]: 53.236

[EX Q]: [227.601, -61.961, 78.822, -29.52, 126.039, -44.098, 112.374, -19.23, 69.758]
[EX A]: 51.087

[EX Q]: [-65.066, -45.439, 30.554, 231.578]
[EX A]:
37.907