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.

[178.031, -52.967, 31.914, 174.681, 155.375, -3.831, 165.333, 10.246, -14.468]
71.59

[248.385, -40.468, -97.132]
36.928

[80.803, 65.546, 76.403, -70.123, 170.782, 214.183, 140.971, 152.912]

103.935