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: [206.822, 138.658, 97.719, 225.274, 206.457, 227.788, 28.568, 130.667, 31.216, 219.85]

151.302