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.

[-56.201, -77.67, -75.53, -51.92, 146.416, 141.525]
4.437

[41.081, 166.314, -14.556, -84.648, -8.286]
19.981

[224.05, 90.637, 205.494, -31.962, -7.077]

96.228