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.

[139.6, 119.652, 135.338, 171.029, 247.554, 222.19, -61.931, 120.928, 235.688]
147.783

[54.715, 180.963, 239.308, 175.084, 147.044, 136.262, 184.009]
159.626

[-34.917, -76.301, 70.253]

-13.655