Yes I am shure

Let's make some example:

The link have 1000 votes and ratint 7.50 if you rate this link with 10

the result is: (1000*7.5)+10 = 7510

votes = 1000 +1

then rating = 7510/ 1001 = 7.502497...

But in tables rating is saved just 7.50

Before new vote rating is 7.50

after new vote rating is 7.50