Questions 1-6 EXERCISES 8.1 PRACTICING THE MOVES AND MANEUVERS Exercises9: Deter

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Questions 1-6

EXERCISES 8.1 PRACTICING THE MOVES AND MANEUVERS Exercises9: Determine whether the random variables are discrete or continuous. 1 Number of people waiting for service at the Pre The number of red lights you stop for on your mium Unleaded line at the Arco station nearest 2 Number of traffic accidents in a week at the bus- 3 The time it takes to walk from finite math class 4 The number of fish you catch on your next fish- 5 The length of the largest fish you catch on your 7 The number of defective TV sets in a shipment 8. The amount of snow that falls in Fairbanks, 9 The number of breakdowns of the campus com- next trip downtown of 200 received by a major department store. Alaska, during December puter during a one-week period. you. iest intersection in your town. to your school residence ing trip. next fishing trip. Exercises 10-12 Use the following probability distribution, which describes random vari- able X = monthly demand for compact disc players in an audio specialty store. 10. What is the probability that the monthly de- mand is for 6 or more players? x = # CD Players p(x) 0.10 0.15 0.25 0.20 0.15 0.10 11. Suppose the store orders 4 CD players at the start of the month. What is the probability of selling all 4? 12. Suppose the store stocks 5 CD players at the start of the month. Assuming they do not order any more, what is the probability that they have at least 2 in stock at the end of the month? 6 or more 114

Explanation / Answer

1. discrete (all place where numbers are referred are discrete because they are integers and not continuous)

2). discrete

3)continuous

4)discrete

5) continuous

6)discrete

7)discrete

8) continuous

9) discrete

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