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:
[130.57, 157.221, 228.177, 32.361, 166.457]

Ex Output:
142.957


Ex Input:
[-3.302, 23.685, 69.661, 74.979, -46.96]

Ex Output:
23.613


Ex Input:
[115.756, 98.561, 208.286, -6.307, 213.174, 117.811, 84.705, 29.085, 59.322]

Ex Output:

102.266