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: [229.254, 187.875, 136.948, 178.625, 144.135, 233.043, 12.15, 98.746]

152.597