College Algebra & Trigonometry, 2018a

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7.6. PROBABILITY 339 A jar contains three yellow balls and five red balls. If four balls are drawn at random (without replacement), find the probability that: 23) two of the balls are yellow and two are red 24) all of the balls are red 25) exactly three of the balls are red 26) two or three of the balls are yellow Assume that the probability of a boy being born is the same as the probability of a girl being born. Find the probability that a family with three children will have: 27) two boys and one girl 28) at least one girl 29) no boys 30) the two oldest children are girls 31) An exam consists of ten True-or-False questions. If a student guesses at every answer, what is the probability that he or she will answer exactly six questions correctly? 32) A law firm employs 14 lawyers, 8 of whom are partners in the firm. If a group of 3 lawyers is chosen at random to attend a conference, what is the probability that 3 partners will be selected? 33) In a lot of 24 computer components, there are four defective components. If two of the components are chosen at random, what is the probability that: a) both of the components are defective? b) at least one of the components is defective?
340 CHAPTER 7. COMBINATORICS 34) A barrel of 60 apples contains 4 rotten apples. If 3 apples are selected at random, what is the probability that 1 or more of the apples is rotten? 35) A shelf at the home improvement store contains 80 light bulbs of which 6 are defective. If a customer chooses 2 light bulbs at random, what is the probability that: a) both are defective? b) at least one is defective? 36) Some computer components are shipped in boxes of 24. Before they are shipped, the quality control inspector randomly chooses 8 components from each box. If any of the 8 components selected are defective, the box is not shipped. What is the probability that a lot containing exactly 2 defective components would be shipped anyway? 37) A business is preparing to choose 12 people to go on a business trip from a group of 100 employees, 60 of whom are women and 40 of whom are men. Suppose that Ed and Mary are both employees and that the 12 people for the trip will be chosen randomly. a) What is the probability that Ed will be chosen? b) What is the probability that Ed and Mary will both be chosen? c) If an equal number of men and women are to go on the trip, what is the probability that Ed will be chosen? d) If an equal number of men and women are to go on the trip, what is the probability that Ed and Mary will both be chosen?
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College Algebra & Trigonometry
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c○2018 Richard W. Beveridge This
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4 CONTENTS 2.4 Solution of Rational
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6 CONTENTS 8.2 The Trigonometric Ra
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8 CONTENTS
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10 CHAPTER 1. ALGEBRA REVIEW Exampl
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12 CHAPTER 1. ALGEBRA REVIEW 2(x +3
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16 CHAPTER 1. ALGEBRA REVIEW Trinom
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20 CHAPTER 1. ALGEBRA REVIEW (3x ?)
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30 CHAPTER 1. ALGEBRA REVIEW Then,
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40 CHAPTER 1. ALGEBRA REVIEW devise
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88 CHAPTER 2. POLYNOMIAL AND RATION
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100 CHAPTER 2. POLYNOMIAL AND RATIO
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190 CHAPTER 4. FUNCTIONS by substit
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192 CHAPTER 4. FUNCTIONS 4.2 Domain
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194 CHAPTER 4. FUNCTIONS Exercises
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196 CHAPTER 4. FUNCTIONS 8) 12 10 8
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198 CHAPTER 4. FUNCTIONS We can use
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200 CHAPTER 4. FUNCTIONS 3) 20 16 1
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202 CHAPTER 4. FUNCTIONS Vertical S
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204 CHAPTER 4. FUNCTIONS Now, if, i
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208 CHAPTER 4. FUNCTIONS Stretching
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242 CHAPTER 4. FUNCTIONS 8) A recta
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248 CHAPTER 4. FUNCTIONS Distance O
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250 CHAPTER 4. FUNCTIONS The graph
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252 CHAPTER 4. FUNCTIONS Distance/T
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258 CHAPTER 5. CONIC SECTIONS - CIR
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College Algebra & Trigonometry, 2018a

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