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: [37.626, -60.565, -32.517, -72.804, 148.789, 184.111, -77.953, 39.64, 188.519]

39.427