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Unformatted text preview: MATH 1131 3.0  Fall 2010 Solution for Assignment 2 Question 1: Student’s Absent Medium Absent Grade Infrequently Absenteeism Frequently Total Low 1 9 8 18 Medium 6 35 7 48 High 8 9 2 19 Total 15 53 17 85 a. Probability that a randomly selected student will have a low grade is 18 85 = 0 . 2118. b. Probability that a randomly selected student absent frequently is 17 85 = 0 . 2. c. Grades and frequency in absent are not independent events because P ( Low grade and Infrequently absent ) 6 = P ( Low grade) P ( Infrequently absent). d. Knowing that a randomly selected student has high grade, the probability that that student is absent frequently is 2 19 = 0 . 1053. e. Probability that a randomly selected student has either high grade or absent frequently is 34 85 = 0 . 4. Question 2: a. Let X be the number of mutated microbes (out of 10 being studied). P ( X = 4) = 10! 4!6! 1 6 4 5 6 6 = 0 . 0543....
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This note was uploaded on 12/22/2010 for the course MATHEMATIC Math 1131 taught by Professor Augustinewong during the Spring '10 term at York University.
 Spring '10
 AugustineWong
 Probability

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