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SME_8e_Ch_07_Section_1

# SME_8e_Ch_07_Section_1 - CHAPTER 7 SECTION 1 RANDOM...

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1 CHAPTER 7 SECTION 1: RANDOM VARIABLES AND DISCRETE PROBABILITY DISTRIBUTIONS MULTIPLE CHOICE 1. The weighted average of the possible values that a random variable X can assume, where the weights are the probabilities of occurrence of those values, is referred to as the: a. variance. b. standard deviation. c. expected value. d. None of these choices. ANS: C PTS: 1 REF: SECTION 7.1 2. The number of accidents that occur annually on a busy stretch of highway is an example of: 3. A function or rule that assigns a numerical value to each simple event of an experiment is called: 4. A table, formula, or graph that shows all possible values a random variable can assume, together with their associated probabilities, is called a(n): 5. Which of the following are required conditions for the distribution of a discrete random variable X that can assume values x i ? a. 0 p ( x i ) 1 for all x i b. p ( x i ) = 1 all x i c. Both a and b are required conditions. d. Neither a nor b are required conditions. ANS: C PTS: 1 REF: SECTION 7.1

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2 6. Which of the following is not a required condition for the distribution of a discrete random variable X that can assume values x i ? all x i 7. In the notation below, X is the random variable, c is a constant, and V refers to the variance. Which of the following laws of variance is not true? 8. Which of the following is a discrete random variable? 9. Which of the following is a continuous random variable? a. The number of employees of an automobile company. b. The amount of milk produced by a cow in one 24-hour period. c. The number of gallons of milk sold at Meijer grocery store last week. d. None of these choices. ANS: B PTS: 1 REF: SECTION 7.1
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SME_8e_Ch_07_Section_1 - CHAPTER 7 SECTION 1 RANDOM...

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