Computer purchases: Out of 768 large purchases made at a computer retaliler, 337

Question

Computer purchases: Out of 768 large purchases made at a computer retaliler, 337 were personal computers, 381 were laptop computers, an d 50 were printers. As a part of an audit, one purchase record is sampled at random. Round the answers to four decimal places, as needed. (a) What is the probability that it is a personal computer? (b) What is the probability that it is not a laptop computer? Part 1 of 2 (a) What is the probability that it is a personal computer? The probability that it is a personal computer is 0.0651 Part 2 of 2 (b) What is the probability that it is not a laptop computer? The probability that it is not a laptop computer is 0.5612

Explanation / Answer

a)

P(it is a personal computer) = Number of personal computers purchased / Total number of items purchased

= 337/768 = 0.4388

b)

P(it is not a laptop computer) = P(it is either a personal computer or a printer)

= [(Number of personal computers purchased) + (Number of printers purchased)] / Total number of items purchased

= (337+50)/768 = 0.5039

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