# SOLUTION: A bag contains 200items of which 20items are defectives.seven items are selected at random 1 aftert another with replacement.what is the probability of obtaning ...questions number

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 Question 496758: A bag contains 200items of which 20items are defectives.seven items are selected at random 1 aftert another with replacement.what is the probability of obtaning ...questions number 1)no defective 2)5non defective from: Probability distribution of binomial problem.Answer by stanbon(57279)   (Show Source): You can put this solution on YOUR website!A bag contains 200 items of which 20 items are defectives. seven items are selected at random 1 after another with replacement. what is the probability of obtaning ...questions number 1)no defective Binomial Problem with n = 7 and p(defect) = 20/200 = 1/10 --- P(x = 0) = 7C0(0.1)^0*(0.9)^7 = 0.9^7 = 0.4783 ----------------------------------------------------- 2)5 non defective that is the same as 2 defective out of 7 P(x = 2) = 7C2(0.1)^2*(0.9)^5 = 0.1240 ================= Cheers, Stan H. ================= --------------------