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: [-82.505, 18.989, 233.566, 131.183, 164.298, 50.856, -82.19, 198.224, -62.661, -36.631]

53.313