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.

[15.799, 6.545, 101.018, -76.074, 51.291, -58.732, 131.857, -36.93, 131.423]
29.577

[209.13, -12.632, 247.489, 55.492, 8.967, -90.158, 193.743]
87.433

[249.053, 95.147, 78.214, 98.619, 235.658, -87.649, 28.294]

99.619