Question regarding ring transactions and privacy

full image - Repost: Question regarding ring transactions and privacy (from Reddit.com, Question regarding ring transactions and privacy)

Hello,Suppose we have the following situation:Alice (A) receives some monero to her KYC exchange account. Afterwards, the change from that monero (let's call it output "O") is sent further to Bob (B). From what I understand, Bob can now say with a 9% (1/11) chance that Alice is connected to the funds that he received.Is that correct? Does the fact that the "O" output was spent in other 10 transactions as a decoy decrease the 9% chance?

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