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]: [210.345, 91.115]
[EX A]: 150.73

[EX Q]: [153.482, 150.917]
[EX A]: 152.2

[EX Q]: [-85.345, 100.504]
[EX A]:
7.58