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:
[155.467, -40.717, -24.529, -22.608, 38.752]

Ex Output:
21.273


Ex Input:
[231.057, 71.527, 201.799, -5.17, -14.963, -35.693]

Ex Output:
74.76


Ex Input:
[197.167, -39.617, 9.231, 158.841, 147.656, 169.999, -27.818, -60.471, -51.856, 8.285]

Ex Output:

51.142