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.

Example Input: [127.522, 232.86, 46.593]
Example Output: 135.658

Example Input: [-62.202, 222.562, -18.684, 67.674, -41.353, 134.927, -92.211]
Example Output: 30.102

Example Input: [8.14, 111.467, 200.595, 104.059, 198.289, 16.858, 214.546, 33.91, 133.532, 126.546]
Example Output:
114.794