Minimum number of correct questions required to pass CLF-C01

The exam documentation states:

Unscored content The exam includes 15 unscored questions that do not affect your score. AWS collects information about candidate performance on these unscored questions to evaluate these questions for future use as scored questions. These unscored questions are not identified on the exam."

If there are 65 questions on the exam and the pass rate is 70% is it correct to say that we only need to get 70% of 50 questions correct (since it doesn't matter if we get the other 15 right or wrong)?