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If 6% of item produced turn out to be defective then find out the probability that out of 20 items selected at random there exactly four defective. |
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Answer» Probability that selected item is defective is p = 6% = 6/100 = 3/50 Probability that selected item is not defective is q = 1 - p = 1 - 3/50 = 47/50 Probability that out of 20 items exactly four items are defective is p(E =4) = 20C4P4q20-4 = 20C4(3/50)4(47/50)16 Hence, the required probability is 20C4 (3/50)4(47/50)16 |
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