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: [139.238, 225.164, -21.563, -22.339, -77.136, 96.772, -40.208, 121.974, 228.852]

Output: 72.306


Input: Consider Input: [22.306, 72.768, 218.947, 52.973, 100.121, 157.59, -92.109]

Output: 76.085


Input: Consider Input: [63.256, 62.034, 64.631, 162.145, 86.782, -23.542, -70.596]


Output: 49.244