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Statistics / Stats: Modeling The World 3 / Chapter 15 / Problem 17

Stats: Modeling The World | 3rd Edition | ISBN: 9780131359581 | Authors: David E. Bock

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17. Batteries. A junk box in your room contains a dozenold

Chapter 15, Problem 17

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QUESTION:

17. Batteries. A junk box in your room contains a dozenold batteries, five of which are totally dead. You startpicking batteries one at a time and testing them. Find theprobability of each outcome.a) The first two you choose are both good.b) At least one of the first three works.c) The first four you pick all work.d) You have to pick 5 batteries to find one that works.

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QUESTION:

17. Batteries. A junk box in your room contains a dozenold batteries, five of which are totally dead. You startpicking batteries one at a time and testing them. Find theprobability of each outcome.a) The first two you choose are both good.b) At least one of the first three works.c) The first four you pick all work.d) You have to pick 5 batteries to find one that works.

ANSWER:

Step 1 of 4

a) Use the multiplication rule:

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