Given a stream of numbers, write an algorithm to print the average (mean) of the stream at any point.

Ex. 10, 20, 30, 40...
Average after 1 number = 10
Average after 2 numbers = 15
Average after 3 numbers = 20
Average after 4 numbers = 25
Average is defined as: sum of all numbers / count of all numbers
All we need for each consective integer is the previous average (prev) and the count (n) of all previous numbers. The average after including new number x is (prev*n + x)/(n + 1).

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