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: [214.108, -10.35, 112.313, 53.317, 183.753, 245.498, 204.905, 68.753, 164.122]

137.38