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: [172.084, 126.948, 90.757]

Output: 129.93

Input: Consider Input: [248.023, 57.595, -73.013, 200.246, 142.738, -70.94, -43.129, -7.477, 200.087, 6.452]

Output: 66.058

Input: Consider Input: [73.637, 249.719, 215.144, 221.034, -6.774, 15.96, -72.507, -15.652]
Output: 85.07