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.

[-44.977, 79.906, -20.036]
4.964

[-81.432, -63.059, 150.144, 55.203, 215.405, -89.797, 72.946]
37.059

[83.926, 146.107]

115.017