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: [149.321, 237.643, 131.636, 64.171, 167.953, 142.336, 151.652, 94.189, 34.424]

130.369