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: [219.576, -88.392, 13.756, 68.58, 185.112, 157.111, -25.941, 116.677]

80.81