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: [220.903, 155.959]

Output: 188.431


Input: Consider Input: [233.742, -71.075]

Output: 81.333


Input: Consider Input: [-17.004, 224.431, 235.745, 70.423, 241.216, -83.057]


Output: 111.959