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.

[38.343, 177.478, 120.174, -74.923, 98.159]
71.846

[224.567, -42.213, 232.017]
138.124

[92.151, 178.898, -79.697, 16.244, 77.745]

57.068