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: [230.02, 185.716, 56.419, 46.123, -30.498, 143.099, -87.367, -65.327, 125.229]

67.046