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: [195.469, 110.294, 150.829, 116.396, 133.183, 75.968, -18.798, 56.574, 67.084]

98.555