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: [-66.907, 142.918, 119.907, -26.032, 133.459, 116.226, 228.722, 200.768, 89.473, 23.599]

96.213