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: [230.673, -25.014, 81.741, 83.984, 15.031, -2.618, 10.709]

56.358