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: [166.723, 224.959, 90.835, 107.749, 46.549, -25.061, -93.156, -67.229, -76.888]

41.609