A process produces strings of Christmas tree lights that historically have experienced a defective rate of 4%.

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?

Distribution
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