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.

[58.371, 4.131]
31.251

[-50.144, 0.802]
-24.671

[97.555, 207.383, 84.292, 186.95, -78.413, 142.159, 32.483]

96.058