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Chapter 3 Solutions(2)-1

# Chapter 3 Solutions(2)-1 - 6 a/b x f x xf x x x 2 x 2 f x...

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Unformatted text preview: 6. a/b. x f ( x ) xf ( x ) x- ( x- ) 2 ( x- ) 2 f ( x ) 0.04 0.00-1.84 3.39 0.12 1 0.34 0.34-0.84 0.71 0.24 2 0.41 0.82 0.16 0.02 0.01 3 0.18 0.53 1.16 1.34 0.24 4 0.04 0.15 2.16 4.66 0.17 Total 1.00 1.84 0.79 E ( x ) Var( x ) c/d. y f ( y ) yf ( y ) y- ( y- ) 2 ( y- ) 2 f ( y ) 0.00 0.00-2.93 8.58 0.01 1 0.03 0.03-1.93 3.72 0.12 2 0.23 0.45-0.93 0.86 0.20 3 0.52 1.55 0.07 0.01 0.00 4 0.22 0.90 1.07 1.15 0.26 Total 1.00 2.93 0.59 E ( y ) Var( y ) e. The number of bedrooms in owner-occupied houses is greater than in renter-occupied houses. The expected number of bedrooms is 1.09 = 2.93 - 1.84 greater. And, the variability in the number of bedrooms is less for the owner-occupied houses. 12. a. Probability of a defective part being produced must be .03 for each trial; trials must be independent. b. 2 outcomes result in exactly one defect. c. P (no defects) = (.97) (.97) = .9409 P (1 defect) = 2 (.03) (.97) = .0582 P (2 defects) = (.03) (.03) = .0009....
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Chapter 3 Solutions(2)-1 - 6 a/b x f x xf x x x 2 x 2 f x...

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