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: [-22.677, 194.105, 74.714, -74.308, 247.931, 103.657, 48.012]

81.633