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.
Q: [70.496, 183.122, 75.017, -19.287, 53.364, -12.389, 249.47, -88.484, 249.98, 35.226]
A: 
79.652