SOLUTION: Of all the stores opened by a company, 90% survive. Assume that each store's chance of survival is independent of the others. What is the probability that at least 8 out of 10 st

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Question 329484: Of all the stores opened by a company, 90% survive. Assume that each store's chance of survival is independent of the others. What is the probability that at least 8 out of 10 stores opened will survive? please show all work, thanks
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
10 survive = 1%280.9%29%5E10%280.1%29%5E0=0.3487
9 survive =10%280.9%29%5E9%280.1%29%5E1=0.3874
8 survive =45%280.9%29%5E8%280.1%29%5E2=0.1937
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P(at least 8)=P%288%29%2BP%289%29%2BP%2810%29=0.9298