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WorkedProblems04

# WorkedProblems04 - CHAPTER 4 Discrete Random Variables 4.2...

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CHAPTER 4: Discrete Random Variables 4.2 The values of a discrete random variable can be counted, or listed; the values of a continuous random variable cannot be counted, or listed. 4.3 a. Discrete b. Discrete c. Continuous d. Discrete e. Discrete f. Continuous g. Continuous 4.4 See page 119 in text. 4.8 a. Valid b. Not valid; p ( x ) = .9 all x c. Not valid; p 1 2 ( 29 = –1 d. Valid 4.14 a. μ x = (300)(.2) + (600)(.6) + (900)(.2) = \$600 b. [ ] x x 2 σ ± contains at least 4 3 of the observed values of x . [ ] x x 2 ± =[600 ± 2(189.74)] = [220.52, 979.48] [ ] x x 3 ± contains at least 9 8 of the observed values of x . [ ] x x 3 ± =[600 ± 3(189.74)] = [30.78, 1169.22] c. Most risk: 3, least risk: 1 Investment 1: [ ] [ ] 660 , 540 3 x x = ± Investment 2: Investment 3:

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d. Investment A: V = σ μ = 600 6000 = .1 Investment B: V = = 190 600 = .317 Investment B carries the greater risk. e.
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WorkedProblems04 - CHAPTER 4 Discrete Random Variables 4.2...

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