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A Student takes a multiple choice Quiz where there are "n" possible answers in each question....

A Student takes a multiple choice Quiz where there are "n" possible answers in each question.
1- The Student answers the question correctly if the Student knows the answer.
2- The Student answers the question randomly if the Student doesn't know the answer.
3- Suppose that the Quiz has 20 questions, and that the Student knows "80%" of the questions correctly.
what is the expected number of questions that the Student will get correctly?

Math   Statistics-And-Probability   
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