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.

[-98.163, -66.763, 149.544, -89.893, -10.155]
-23.086

[243.697, 165.796, 114.518, 207.298, 191.227]
184.507

[152.42, -48.983, 32.999, 147.185, -58.145, 65.985, 15.968, -53.935, -82.639]

18.984