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sta4321-14-1

# sta4321-14-1 - Arthur Berg §2.4 Counting Rules Useful in...

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§2.4 Counting Rules Useful in Probability

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Exercises Exercise 4.67, 4.68, 4.69, 4.70 (p.165) 4.67 Suppose that 10% of the engines manufactured on a certain assembly line are defective. If engines are randomly selected one at a time and tested, Fnd the probability that exactly two defective engines will be found before a good engine is found. 4.68 Given that the Frst two engines are defective, Fnd the probability that at least two more defectives are tested before the Frst nondefective engine is found. 4.69a ±ind the probability that the 5th nondefective engine will be found when the 7th engine is tested. 4.70b ±ind the mean and variance of the number of defectives tested before the third nondefective engine is found.
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Unformatted text preview: Arthur Berg §2.4 Counting Rules Useful in Probability 2/ 3 Exercises Exercise 4.114 (p. 185) A student has a drawer with 20 AA batteries. However, three of the twenty batteries were old batteries that she accidently placed back in the drawer. She realizes that the batteries on her calculator are no longer working, and she is in a hurry to get to a test. She grabs two batteries from the drawer at random to replace the two batteries in her calculator. What is the probability that she will get two good batteries so that her calculator will work during the test? Arthur Berg §2.4 Counting Rules Useful in Probability 3/ 3...
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sta4321-14-1 - Arthur Berg §2.4 Counting Rules Useful in...

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