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:
[-74.139, -62.711, 83.1, 211.243, -2.696, 30.722, 79.262, 230.335]

Ex Output:
61.89


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

Ex Output:
56.649


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

Ex Output:

134.179