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:
[-94.286, 148.737, 234.8, 148.972]

Ex Output:
109.556


Ex Input:
[43.362, 111.151, 162.709, 43.974, 184.165, 238.15, 181.927]

Ex Output:
137.92


Ex Input:
[90.323, 130.001, 47.957]

Ex Output:

89.427