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.

[80.346, 228.37, 18.978, -42.02]
71.419

[246.282, 231.815, 1.709, -51.234, -76.432, 21.802, 18.917, 106.734, 168.909, -67.647]
60.085

[193.506, 145.362, 144.533, -14.497, 22.442, -5.632, -5.134]

68.654

