# SOLUTION: A package of 12 recordable CDs contains 3 which are defective. If 4 CDs are selected at random, find the probability that: a. No defective CDs are found. b. 1 of the 4 CDs i

Algebra ->  Algebra  -> Probability-and-statistics -> SOLUTION: A package of 12 recordable CDs contains 3 which are defective. If 4 CDs are selected at random, find the probability that: a. No defective CDs are found. b. 1 of the 4 CDs i      Log On

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 Question 131112: A package of 12 recordable CDs contains 3 which are defective. If 4 CDs are selected at random, find the probability that: a. No defective CDs are found. b. 1 of the 4 CDs is defective. c. 3 of the 4 CDs are defective. Not a text book question. Thank you for your help :) Answer by stanbon(57380)   (Show Source): You can put this solution on YOUR website!A package of 12 recordable CDs contains 3 which are defective. If 4 CDs are selected at random, find the probability that: a. No defective CDs are found. b. 1 of the 4 CDs is defective. c. 3 of the 4 CDs are defective. ------------ P(defective)= 3/12 = 1/4; P(non defective)=3/4 ---------------------- a. P(No defective CDs are found)= (3/4)^4 b. P(1 of the 4 CDs is defective)= 4C1(1/4)(3/4)^3 = 0.421875... c. P(3 of the 4 CDs are defective)=4C3(1/4)^3(3/4)= 0.421875... -------------- Cheers, Stan H.