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: [-33.609, 163.86, -20.657, 121.821, 205.856, 88.277, -93.024, 8.641, 200.345, 101.194]

74.27