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.

Input: Consider Input: [26.857, -69.553, -37.942]

Output: -26.879


Input: Consider Input: [220.903, 155.959]

Output: 188.431


Input: Consider Input: [-11.415, -7.455, 87.351]


Output: 22.827