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:
[156.41, 19.521, 110.08, -59.009, 49.787, 243.748, -25.285, -71.104, 131.859, -70.207]

Ex Output:
48.58


Ex Input:
[224.567, -42.213, 232.017]

Ex Output:
138.124


Ex Input:
[247.977, 80.489, -8.363, 7.214]

Ex Output:

81.829