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:
[-65.295, 113.842, -82.683, 235.996, 143.686, 31.127, 135.386, 217.657, -87.331]

Ex Output:
71.376


Ex Input:
[-10.287, -0.47, 195.152, 209.845, -64.645, -82.959, 106.327]

Ex Output:
50.423


Ex Input:
[-8.6, 148.356, 21.188, 129.408, 189.687, -3.91, 102.347, -75.62, 103.278, 198.339]

Ex Output:

80.447