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.

[146.815, 125.411, 84.472, -63.01, 79.256, -34.213, 248.004, -86.96, -39.397]
51.153

[135.575, 134.352, 209.54, 199.614, 87.027, 215.933, 49.266, 167.288, 164.589]
151.465

[165.78, -65.839, -70.05, -8.504, -77.289, 141.978, -2.607, -86.849, 92.431, 209.984]

29.904

