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: [-80.198, 169.031, 131.549, 162.898, 244.553, -55.66, 219.031]

113.029