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.

[-17.141, 203.132, -6.872, 155.222, -99.642]
46.94

[1.222, 33.339, 163.969]
66.177

[-0.045, 18.716, 163.218, 150.247, -22.261, 63.849, -1.13]

53.228