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: [139.326, 10.384, -67.466, 246.644, 122.032, -63.536, -26.562, -64.305]

37.065