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Unformatted text preview: Therefore, the answer is ( 5 2 ) * 3! = 60 . 2 Section 3.2 2.1 Problem 18 Let X stands for the number of correct answers. If by guessing, the probability of answering correctly for each question is 1 / 2. P ( X 2) = i =2 X i =0 10 i ( . 5) 10 = 0 . 05469 P ( X = 0) = 10 ( . 5) 10 = 0 . 00098 Now it is a binomial problem for comment Prosser or Crowell. Prosser: Binomial (340 , . 05469) Let Y denote the number of students getting 2 or fewer answers correct. P ( Y 1) = 1P ( Y = 0) (1) = 1 340 * (1. 05469) 340 * (0 . 05469) (2) = 13 . 491534 * 109 (3) = 1 (4) within 5 digits after decimal place (5) Crowell: Binomial (340 , . 00098) Let Z denote the number of students getting 0 answers correct. P ( Z 1) = 1P ( Z = 0) (6) = 1 340 * (1. 00098) 340 * (0 . 00098) (7) 2 = 1. 71651 (8) = 0 . 28349 (9) Therefore, we know that Proseer is correct. 3...
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 '07
 TrietLe
 Math

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