SOLUTION: A quality control inspector has drawn a sample of 7 light bulbs from a recent production lot. Suppose that 40% of the bulbs in the lot are defective. What is the standard deviati

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Question 1152992: A quality control inspector has drawn a sample of 7 light bulbs from a recent production lot. Suppose that 40% of the bulbs in the lot are defective. What is the standard deviation of the number of defective bulbs in the sample? Round your answer to two decimal places.
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
Variance of a binomial function is np(1-p)
=7(0.4)(0.6)1.68
sd is sqrt (V)=1.30