In a class, the grade of a student on an exam is an RV with expectation 60 and variance 16. If the class average is between 55 and 65, with a…

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In a class, the grade of a student on an exam is an RV with expectation 60 and variance 16. If the class average is between 55 and 65, with a probability greater than or equal to 0.9, determine the number of students that have taken the exam.

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