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.

[-19.26, 130.53, 225.367, 179.475, -63.39]
90.544

[194.964, 80.506, -41.268, 32.912, -21.6, 21.543, 69.269]
48.047

[69.992, 83.662, 67.177, 95.241, 232.358, 165.146, 147.904]

123.069