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.
[245.134, 62.209, 94.18, 238.218, 28.385, 150.906, 139.02, 246.925, 126.08]