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.

[30.7, 241.916, 245.677, -26.708, 212.446, 81.786, 208.412, 237.096, 155.359]
154.076

[126.136, -23.429, -25.125, -32.203, 36.405, 44.406, 147.828, -97.708, -69.793, 235.046]
34.156

[181.04, 134.761, 98.01, 16.186, 203.134, 184.017, -11.892]

115.037