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Wup 7 8

dennis-leach
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Wup 7 8

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  1. 1. A manufacturer produces a large number of toasters. From past experience, the manufacturer knows that approximately 2% are defective. In a quality control procedure, we randomly select 20 toasters for testing. We want to determine the probability that no more than one of these toasters is defective. (a) Is a binomial distribution a reasonable probability model for the random variable X? State your reasons clearly. (b) Determine the probability that exactly one of the toasters is defective. (c) Define the random variable. X = ______________. Then find the mean and standard deviation for X. (d) Find the probability that at most two of the toasters are defective. (Include enough details so that it can be understood how you arrived at your answer.) 2. Draw a card from a standard deck of 52 playing cards, observe the card, and replace the card within the deck. Count the number of times you draw a card in this manner until you observe a jack. Is a binomial distribution a reasonable probability model for the random variable X? State your reasons clearly.

  2. There is a probability of 0.08 that a vaccine will cause a certain side effect. Suppose that a number of patients are inoculated with the vaccine. We are interested in the number of patients vaccinated until the first side effect is observed. 1. Define the random variable of interest. X = _____ 2. Verify that this describes a geometric setting. 3. Find the probability that exactly 5 patients must be vaccinated in order to observe the first side effect. 4. Construct a probability distribution table for X (up through X = 5). 5. How many patients would you expect to have to vaccinate in order to observe the first side effect? 6. What is the probability that the number of patients vaccinated until the first side effect is observed is at most 5?

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