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Just have a quick question on a binomial problem.

The problem is as follows:

A teacher is giving a 15 question true-false quiz. He wants to design the quiz such that a person that guesses on all the answers have less than a 0.10 probability of passing. What should the teacher put as the passing number of questions to achieve this?

I have no idea how to do this.

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# Need help on simple binomial problem

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