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: [-76.82, 7.764, -98.515, -90.606, 232.886, 213.332, 78.674, 235.391, 41.983]

60.454