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:
[-66.735, 23.822, -34.5, 118.327, 242.333]

Ex Output:
56.649


Ex Input:
[84.13, 59.186, 115.606]

Ex Output:
86.307


Ex Input:
[218.586, 30.112, 136.184, 145.044, 225.977, 114.078, 146.556]

Ex Output:

145.22