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.

[-92.167, -67.984, -31.831, -21.057, 101.792, 114.116, 185.901, -25.874]
20.362

[-8.87, 232.908, 141.714, -47.559, 161.192, 203.441]
113.804

[57.463, 117.862, 228.694, 221.841, 68.35, 178.129, 13.932, 240.72, 139.1]

140.677