SOLUTION: The J.O. Supply Company buys calculators from a Korean supplier. The probability of a defective calculator is 10%. 100 calculators are selected at random. What is the expected n
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Question 719387: The J.O. Supply Company buys calculators from a Korean supplier. The probability of a defective calculator is 10%. 100 calculators are selected at random. What is the expected number of defectives? What is the standard deviation? What is the probability that 3 or more calculators will be defective?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The J.O. Supply Company buys calculators from a Korean supplier.
The probability of a defective calculator is 10%.
100 calculators are selected at random.
What is the expected number of defectives?
E(x) = np = 100*0.10 = 10
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What is the standard deviation?
std = sqrt(npq) = sqrt(10*0.9) = 3
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What is the probability that 3 or more calculators will be defective?
P(3 or more) = 1 - P(0<= x <=2) = 1 - binomcdf(100,0.1,2) = 0.9900
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Cheers,
Stan H.
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