SOLUTION: A shelf in the Metro Department Store contains 80 colored ink cartridges for a popular ink-jet printer. 5 of these cartridges are defective. (a) If a customer selects 3 of these c

Question 867206: A shelf in the Metro Department Store contains 80 colored ink cartridges for a popular ink-jet printer. 5 of these cartridges are defective.
(a) If a customer selects 3 of these cartridges at random from a shelf, what is the probability that they are all defective? (Round your answer to five decimal places.)

(b) If a customer selects 3 of these cartridges at random from a shelf, what is the probability that at least 1 is defective? (Round your answer to three decimal places.)

Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
p(def) = 5/80 = 1/16, n = 3
P(sll def) = (1/16)^3
P(at least one def) = 1 - P(none) = 1-(15/16)^3
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