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I'm glad I'm not the only one. That problem was driving me insane. Out of all the practice exams and practice problems I did, this is the only problem where I couldn't for the life of me figure out how the answer key got their answer no matter how long I thought about it or looked at their solution.
Actually, I think it has to do with the integer correction and adding or subtracting .5. However, The 95% range would be + 9.8. The continuity correction shouldn't make that go down to 9. It's hard to remember what I did since I sold my manual.Last edited by Hello Actuaria/ Stars; June 2 2011, 01:38 AM.

Is this question 7 on page 452? If so, it's errata. I found an errata list online.Last edited by Hello Actuaria/ Stars; June 2 2011, 01:39 AM.
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The probability that the number of heads is between 41 and 59 inclusive is only 93.9%. It looks like a mistake in the book.
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Originally posted by alekhine4149 View PostThe probability that the number of heads is between 41 and 59 inclusive is only 93.9%. It looks like a mistake in the book.
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I think for sanity's sake I'm just going to chalk it up as an error in the manual. Probability gives me trouble at times and this one will only confuse me more. Thanks for your help.
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Originally posted by Hello Actuaria/ Stars View PostUsing integer correction, then it's the probability of being between 40.5 and 59.5. Which is 94.26%. That's still too small though.
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