SOLUTION: In a batch of 100 CDs 6 are defective. A sample of three Cds is to be selected at random. What is the probability that two of the three Cds will be defective
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Question 1200689: In a batch of 100 CDs 6 are defective. A sample of three Cds is to be selected at random. What is the probability that two of the three Cds will be defective Answer by ikleyn(52915) (Show Source):
The number of all possible triples from 100 CDs is
= = 161700.
The number of triples CDs, that contain exactly 2 of 6 defective CDs is
= 15*94 = 1410.
The desired probability is the ratio of these numbers
P = = 0.00872 (rounded). ANSWER
