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.

[-96.796, 127.634, 135.049, -55.677, 11.648, 72.63, 176.028, 48.486, 209.389, -13.558]

61.483