# An electronics store is offering a special price on a

## Problem 32E Chapter 2

Probability and Statistics for Engineering and the Sciences | 9th Edition

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Problem 32E

An electronics store is offering a special price on a complete set of components (receiver, compact disc player, speakers, turntable). A purchaser is offered a choice of manufacturer for each component: Receiver: Kellwood, Onkyo, Pioneer, Sony, Sherwood Compact disc player: Onkyo, Pioneer, Sony, Technics Speakers: Boston, Infinity, Polk Turntable: Onkyo, Sony, Teac, Technics A switchboard display in the store allows a customer to hook together any selection of components (consisting of one of each type). Use the product rules to answer the following questions: a. In how many ways can one component of each type be selected? b. In how many ways can components be selected if both the receiver and the compact disc player are to be Sony? c. In how many ways can components be selected if none is to be Sony? d. In how many ways can a selection be made if at least one Sony component is to be included? e. If someone flips switches on the selection in a completely random fashion, what is the probability that the system selected contains at least one Sony component? Exactly one Sony component?

Step-by-Step Solution:

Answer: Step 1 of 4 Given, An electronics store is offering a special price on a complete set of components (receiver, compact disc player, speakers, turntable). A purchaser is offered a choice of manufacturer for each component: Receiver: Kellwood, Onkyo, Pioneer, Sony, Sherwood Compact disc player: Onkyo, Pioneer, Sony, Technics Speakers: Boston, Infinity, Polk Turntable: Onkyo, Sony, Teac, Technics A switchboard display in the store allows a customer to hook together any selection of components (consisting of one of each type). a. In how many ways can one component of each type be selected. 5C ×14C × 1C × 4C1= 5 × 1 × 3 × 4 = 240 Hence, one component of each type be selected in 240 ways. Step 2 of 4 b. In how many ways can components be selected if both the receiver and the compact disc player are to be Sony. 1C ×11C × 1C × 4C1= 1 × 1 × 3 × 4 = 12 Hence, if both the receiver and the compact disc player are to be sony then components be selected in 12 ways. c. In how many ways can components be selected if none is to be Sony 4C ×13C × 1C × 3C1= 4 × 1 × 3 × 3 = 108 Hence, there are 108 ways can components be selected if none is to be Sony.

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