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: [-83.223, 122.947, 181.072, 38.959, 135.649, 56.109, -35.425, 245.127, -27.469, -36.231]

59.752