Calculating Probability of Defective Products

35% of products made by company Z are defective. A sample of 9 products is chosen. Find:

a) The probability that 2 are defective
b) The probability that 3 are defective
c) The probability that none are defective

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...and 7 are not. So for each choice, prob=35%^2*65%^7
Thus the total prob=36*0.35^2*0.65^7=21.62%

(b) Choose 3 ...