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Airida [17]
3 years ago
5

A shelf in the Metro Department Store contains 95 colored ink cartridges for a popular ink-jet printer. Five of the cartridges a

re defective.
(a) If a customer selects 3 cartridges at random from the shelf, what is the probability that they are all defective? (Round your answer to five decimal places.)

(b) If a customer selects 3 cartridges at random from the shelf, what is the probability that at least 1 is defective? (Round your answer to three decimal places.)
Business
1 answer:
mina [271]3 years ago
7 0
<span>(7C3 * 73C0) / 80C3
 but that = (35 * 1) / 80C3
= 35 / 82160
 = .00043 

For B

</span><span>(7C1 * 73C2 + 7C2 * 73C1 + 7C3 * 73C0) / 80C3
 = 19964 / 82160 = .243
</span>hope it helps
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see Exhibit 4 attached.

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