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:
[207.165, 246.399, 44.821, -21.671]

Ex Output:
119.178


Ex Input:
[219.336, -29.108, -41.612, 105.709]

Ex Output:
63.581


Ex Input:
[137.218, 44.779, 171.36, 92.564, 145.911, 204.559, 142.86]

Ex Output:

134.179


