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: [-6.572, 60.286, 204.525, 109.51, 50.343, 98.754, -78.764, -79.969, 245.927, 86.753]

69.079