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Practice Final Exam Solns AU10

Practice Final Exam Solns AU10 - Solutions 1 A B C D 2 A B...

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Solutions Multiple Choice and True False 1. A B C D 2. A B C D 3. A B C D 4. A B C D 5. A B C D 6. A B C D 7. A B C D ________________________________ 8. A B C D 9. A B C D 10. A B C D 11. A B C D 12. A B C D 13. A B C D 14. A B C D _______________________________ 15. A B C D 16. A B C D 17. A B C D 18. A B C D 19. A B C D 20. A B C D 21. A B C D 1
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Results show that 30% of all OSU students live within 3 blocks of campus. 21. You choose 8 OSU students at random. What is the chance that more than 4 of them live within 3 blocks of campus? Binomial: n=8, p=0.3 P(X > 4) = P(X=5) + P(X=6) + P(X=7) + P(X=8) = 0.0467 + 0.0100 + 0.0012 + 0.0001 (from table) = 0.058 ANS__0.058 ______ 22. You choose 100 OSU students at random. What is the chance that more than 35 of them live within 3 blocks of campus? Normal Approximation to the Binomial 10 30 3 . 0 100 = × = np 10 70 7 . 0 100 ) 1 ( = × = - p n 30 3 . 0 100 = × = = np X μ 583 . 4 21 7 . 0 3 . 0 100 ) 1 ( = = × × = - = p np X σ 09 . 1 583 . 4 30 35 = - = - = σ μ X Z P(X > 35) = P(Z > 1.09) = 1 - 0.8621 = 0.1379 ANS___0.1379 _____ 23. A group of randomly selected 50 sales representatives from a company had average sales of $107.5 million this year. (Assume the standard deviation of sales is stable at $20.5 million.) a. You want to estimate the average sales for the entire company this year. Find
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