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: [19.314, 73.737, 132.099, 224.051, 53.872, 21.127, 182.113, -52.083, 185.871]

93.345