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Changed "rbinom(10" to "rbinom(n()" to improve the code and make sure that it doesnt break when you use a different dataset.
People reading the book might to try your code on their dataset. They might get stuck at this part. With "n()" there is a good alternative to hardcoding "10". I am not completely sure that it does not have sideeffects - so better do a thorough check before you adopt the pull request.