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]: [57.478, 212.225, -90.816, -10.092, 238.514, 60.36, 59.627]
[EX A]: 75.328

[EX Q]: [89.583, 153.453, 20.381, -17.436, -31.071, 91.041, 198.063]
[EX A]: 72.002

[EX Q]: [206.49, 142.105, -86.289, 247.909, -67.045, 12.449, 64.45, 142.742, -18.657, 170.507]
[EX A]:
81.466