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]: [21.007, 48.739, -49.831, -22.699]
[EX A]: -0.696

[EX Q]: [211.927, 190.941, -74.44, 7.991, -80.894, 48.291, 127.383, -51.774]
[EX A]: 47.428

[EX Q]: [123.511, 37.811, 249.595, -25.324]
[EX A]:
96.398