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: [201.251, 30.491, 63.488, 124.478, 121.544, 158.625, 84.453]

112.047