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.

[30.448, 132.545, 166.304, 202.59]
132.972

[204.235, -53.675, 201.303, 20.869]
93.183

[-6.992, -36.177, -95.203, 87.142]

-12.808