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.

[-19.13, 98.86, 158.686, 230.23]
117.161

[206.606, -76.103, -16.863, 44.126, 4.019, 15.088]
29.479

[102.115, 237.034, 176.879, 29.401, -85.078, 225.883, 106.49, 242.128, 40.775, -18.185]

105.744