Given the task definition and input, reply with output. 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.

[149.427, 77.161, 73.68, 99.415, -56.392, -45.358, -46.051, 195.746]

55.954