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.

[-3.281, 84.204, -74.415, 151.616, 14.048, -98.313, 95.625, -79.981]
11.188

[-19.13, 98.86, 158.686, 230.23]
117.161

[-13.67, -10.677, 143.161, 202.44, 159.612, -30.358, 175.917]

89.489