Test 1 Solutions

Test 1 Solutions - STAT 230 Test 1 May 17, 2006 3:30 4:10...

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STAT 230 Test 1 May 17, 2006 3:30 – 4:10 pm 1. STAT 230 has three sections in the Spring 2006. Three students (David, Peter and Jon) registered for the course, and each of them chose a section at random. Find the probabilities of the following events. [2] (a) A = “The three students are all in the same section” P ( A ) = 3 / 3 3 = 1 / 9. [2] (b) B = “The three students are all in different sections” P ( B ) = 3! / 3 3 = 2 / 9. [2] (c) C = “None of them is in Section 2” P ( C ) = 2 3 / 3 3 = 8 / 27. [2] (d) D = “At least one of them is in Section 2” P ( D ) = 1 - P ( C ) = 19 / 27. [2] (e) E = “Peter is not in Section 1 and Jon is not in Section 2” P ( E ) = (2 × 2 × 3) / 3 3 = 4 / 9 2. A student club consists of 10 students majored in statistics (ST) and 12 majored in computer science (CS). Six ST students and five CS students are female. Suppose four club members are randomly selected (without replacement) to form a task team . Let A = “Exactly two of the team members are CS students” B = “Exactly two of the team members are female” [2] (a) Show that P ( A ) = 0 . 406 and P ( B ) = 0 . 414. P
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Test 1 Solutions - STAT 230 Test 1 May 17, 2006 3:30 4:10...

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