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: [70.485, 231.704, -98.046, -30.011, 80.665, 168.282, 224.41]

92.498