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: [-82.456, 123.519, 249.576, -62.202, 175.773, -56.701, -43.633, 117.971, -5.26, 106.268]

52.286