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.

[125.332, 80.443]
102.887

[-17.026, 165.89]
74.432

[129.656, -24.537, 154.065, -35.645, -87.362, 0.345, 209.304]

49.404