Question

A process produces strings of Christmas tree lights that historically have experienced a defective rate of 4%. A customer has placed an order for 150 strings of lights. Use the normal approximation to the binomial distribution to answer the following:
a. Calculate the mean and standard deviation for this distribution.
b. What is the probability that less than 2 strings in this order will be defective?
c. What is the probability that exactly 7 strings in this order will be defective?
d. What is the probability that 3, 4, or 5 strings in this order will be defective?
e. What is the probability that 8, 9, or 10 strings in this order will be defective?


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  • CreatedJuly 17, 2015
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