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]: [-20.155, -42.404]
[EX A]: -31.28

[EX Q]: [26.595, 220.402, -36.236, -79.382, -17.51, -71.282]
[EX A]: 7.098

[EX Q]: [25.58, 99.319, 165.429]
[EX A]:
96.776