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.

[24.936, 118.724, 203.784, 6.739, 156.178, 111.211, -27.508, -81.763, 206.653, -14.826]
70.413