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: [-45.709, 121.021, 47.686, 106.517, 82.047, 174.704, 194.464, -68.875, 98.607, 200.625]

91.109