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:
[217.523, 92.701, -55.65, -89.359, 55.742, 158.634, -31.883, 206.554]

Ex Output:
69.283


Ex Input:
[47.595, -7.171, 4.333, 160.025, 152.275, 90.23, 128.643, 145.181]

Ex Output:
90.139


Ex Input:
[103.918, 125.608, 205.079, 103.427, -21.898, -46.506]

Ex Output:

78.271