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: [-47.619, -27.573, 73.321, -2.999, 103.788, 127.706, 7.672, -72.728, 160.33, -57.847]

26.405