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# SamEx1ans - S tandard program in middle school S = GG GS SG...

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Brief Answers for Exam 1 1. (a) at least 3/4 (b) Don’t buy, at most 9% over 60 feet tall 2. (a) yes, 0 p ( x ) 1 for all x , p ( x ) = 1 (b) μ = E ( x ) = 3 . 17 3. (a) 4 = μ - 2 σ , approx. 2.5th percentile (b) - 2 . 14 (c) z-score for 3 is - 4, don’t believe its July, z-score too small (rare event) 4. (a) 14 (b) 15 (c) s (6 - 14) 2 + (20 - 14) 2 + ··· (15 - 14) 2 4 5. (a) Let GS denote the event that the student is in the ( G)ifted program in grade school AND the
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Unformatted text preview: S tandard program in middle school S = { GG GS SG SS } P ( GG ) = . 08 P ( GS ) = . 02 P ( SG ) = . 045 P ( SS ) = . 855 } (b) (i) Discrete, x can take on only 3 possible values, 0 , 1 , 2 (ii) x p(x) .855 1 .065 2 .080 6. . 54 /. 66 = . 8181 7. (a) (ii) (b) (iii) 8. (a) . 82 (b) . 18 /. 45 (c) (v) (d) (ii) 1...
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