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: [-28.295, -24.828, -66.96, -12.108, -96.597, 110.99, 172.86, -18.752, 157.717]

Output: 21.559


Input: Consider Input: [-15.843, 236.17, -79.922, -29.879]

Output: 27.632


Input: Consider Input: [56.731, -88.6, 186.966, 171.149, -58.904, 24.133, 82.423, 25.83, 78.767]


Output: 53.166