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: [247.77, 12.17, 124.226, 208.594, -52.038, -84.444, -67.881, 24.99, -47.418, 15.671]

38.164