Chapter 8 Quiz

Chapter 8 Quiz - 2 It is estimated that 48 of all motorists...

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Chapter 8 Quiz Name __________________________________ 1. A consumer organization wants to test a manufacturer’s claim that its light bulbs last an average of 200 days with a standard deviation of 20 days. a. What is the probability that an individual bulb will have a life greater than 205 days? (4) b. What is the probability that the mean lifetime of a sample of 50 bulbs is greater than 205 days? (8)
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Unformatted text preview: 2. It is estimated that 48% of all motorists use their seat belts. If a police officer observes 400 cars go by in an hour, what is the probability that the proportion of drivers wearing seat belts is less than 45% (8)...
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