SOLUTION: If the probability of defective bolt be 1/10,Find the mean and variance for binomial distribution of defective bolts in a sample of 400 bolts.

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Question 559471: If the probability of defective bolt be 1/10,Find the mean and variance for binomial distribution of defective bolts in a sample of 400 bolts.
Answer by AnlytcPhil(1806)   (Show Source): You can put this solution on YOUR website!
mean = (number)×(probability)

mean = 400× = 40

variance = (number)×(probability)×(One minus probability)

variance = (400)×(1/10)×(1-) = (400)×()×(-) = (400)×()×() = 40× =  = 36

Edwin
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