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.

Ex Input:
[139.238, 225.164, -21.563, -22.339, -77.136, 96.772, -40.208, 121.974, 228.852]

Ex Output:
72.306


Ex Input:
[87.258, 29.558, -48.199, -28.615, 46.642]

Ex Output:
17.329


Ex Input:
[105.723, 88.794, 91.675, -40.001, 96.893, -74.548]

Ex Output:

44.756