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: [91.045, 234.572, 89.422, 184.631, 30.183, 51.847, -52.049, -69.077, 108.626, 106.619]

77.582