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.

[-20.702, 4.455, 37.838, 102.751, 231.6, -23.075, 236.527, 227.109, 171.708, 46.239]
101.445

[9.828, 248.054, 20.871, 99.749, 52.797, -86.856, 65.438, 53.627]
57.939

[28.703, 26.223, 100.033, -80.326, -33.283, 241.038, 159.239, -82.352, -90.916]

29.818

