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.

[58.371, 4.131]
31.251

[70.282, -54.718, 95.793, 94.043, 183.314]
77.743

[52.744, 72.439, 195.894, 113.07, 143.577, 11.742]

98.244