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]: [102.524, 88.129, 196.972]
[EX A]: 129.208

[EX Q]: [229.461, -89.251, 170.954]
[EX A]: 103.721

[EX Q]: [-42.289, 144.521]
[EX A]:
51.116