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.
[53.969, 35.428, -38.928, -15.972, 214.296, 69.342, 125.925, 8.745, 175.228, 68.531]