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.

[145.468, -4.908, -83.481, -29.278, 71.597, -97.832, 129.486, 75.188, 207.193, -95.616]

31.782