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: [214.305, 90.176, -95.356, 231.798, 134.836, 135.63, -43.326]

95.438