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The question has been truncated.

I suspect it either should end: "...none of the calculators work," in which case:

for all 3 to be faulty the probability is 1/10 × 1/10 × 1/10 = 1/1000 = 0.001 = 0.1 %

or: "...none of the calculators are faulty," in which case:

for all 3 to not be faulty the probability = 9/10 × 9/10 × 9/10 = 729/1000 = 0.729 = 72.9 %

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8y ago
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8y ago

Unfortunately, the browser used by Answers.com for posting questions limits the size of the question. In this case it is not clear whether you are asking about "none of the calculators work" or "none of them are defective"!

Prob(None work) = 0.001

Prob(None defective) = 0.729)

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Q: Company buys calculators from a Korean supplier The probability of a defective calculator is 10 percent If three calculators are selected at random what is the probability that none of the calculato?
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