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35 Multiple choice tests Here is a simple probability model for multiple choice tests Suppose...

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35 Multiple choice tests Here is a simple probability model for multiple choice tests Suppose each student has probability p of correctly answering a question cho sen at random from a universe of possible questions A strong student has a higher p than a weak student Answers to different questions are independent a Stacey is a good student for whom p 0 75 Use the Normal approximation to find the probabil ity that Stacey scores between 70 and 80 on a 100 question test b If the test contains 250 questions what is the prob ability that Stacey will score between 70 and 80 You see that Stacey s score on the longer test is more

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