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: [178.031, -52.967, 31.914, 174.681, 155.375, -3.831, 165.333, 10.246, -14.468]

Output: 71.59


Input: Consider Input: [57.506, 172.357, 191.473, 131.849]

Output: 138.296


Input: Consider Input: [15.32, 225.178, 183.674, 115.255, 217.914, -0.017, 193.042, 57.041, 7.858, 63.571]


Output: 107.884


