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: [147.015, 188.149, 113.67, -47.563, -56.101, -60.749, 227.499, 56.597]

71.065