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: [213.2, 159.287, 214.859, 189.464, 185.706, -85.847, 215.647, 8.545]

Output: 137.608

Input: Consider Input: [-81.517, 126.001, 203.19, 236.819, 36.037, 152.691, -1.444, -37.296]

Output: 79.31

Input: Consider Input: [172.686, 46.972, 139.657, -30.122, 126.099, 89.965, 145.669]
Output: 98.704