What is the variance and standard deviation

Reference no: EM131165893

What is the variance and standard deviation for the number of right answers for someone taking a 100 question short answer test where each answer is graded either correct or incorrect if the person knows 80% of the subject material for the test the test and answers correctly each question she knows? Should we be surprised if such a student scores 90 or above on the test?

Reference no: EM131165893

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