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]: [182.441, 58.468, 209.229, 249.908, 32.346, 30.442]
[EX A]: 127.139

[EX Q]: [166.762, -42.723, -31.256, 206.5]
[EX A]:
74.821