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:
[220.903, 155.959]

Ex Output:
188.431


Ex Input:
[85.354, -22.629, 51.171, 238.376, 177.126, -90.135, -84.086, 175.426, -80.74]

Ex Output:
49.985


Ex Input:
[-64.689, 102.388, -7.548, -94.157, 67.533, -46.354, 217.479, 99.944, 1.462]

Ex Output:

30.673