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:
[141.597, -13.558, -15.987, -52.44, 77.914]

Ex Output:
27.505


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:
[-6.485, 220.59, 172.044, -34.995, 247.407, 116.292, -39.344]

Ex Output:

96.501