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: [246.667, 89.856, 246.847, 179.58, -56.263, -10.051, -26.273, -75.978]

74.298