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: [200.982, 179.659, 46.905, 146.598, 233.391, 0.725, 132.239, 12.274, 207.432, 216.78]

137.698