Definition: 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.
Input: [68.753, 227.258, -67.293, 20.852, -48.419, 244.182, 75.629, 146.521, 23.542]

76.781