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.

[159.965, 172.082]
166.024

[246.744, 206.484, 194.841]
216.023

[-23.445, 144.846, 74.158, -40.879, -20.022, -53.147, 208.229]

41.391