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]: [166.967, 154.381, -19.741, 157.124]
[EX A]: 114.683

[EX Q]: [61.761, 6.557, -93.386, -74.064, 33.4, 141.295]
[EX A]: 12.594

[EX Q]: [211.455, 178.535, -33.689, 57.265, 117.164, 174.601]
[EX A]:
117.555