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.

[135.962, 136.509, 77.88, 148.448]
124.7

[198.475, -38.691]
79.892

[23.412, 178.154, -91.981, -66.234]

10.838