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

[-42.207, -46.667, 171.095]
27.407

[-46.676, -68.255, 113.203, -43.339, 134.352, 70.198, 249.627]

58.444