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: [193.834, -45.858, 225.442, -60.124, 83.034, 177.578, 239.811, 78.765, 75.457]

107.549