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Chapter 18 Homework 1 of 1 http :// ezto . mheducation . com / hm . tpx During the morning hours at a catalog sales department , telephone calls come in at the rate ( Poisson ) of 39 per hour . Calls that cannot be answered immediately are put on hold . The system can handle 8 callers on hold . If additional calls come in , they receive a busy signal . The 3 customer service representatives who answer the calls spend an average of 3 minutes with a customer . Use Table 1 and Table 2 . a . What is the probability that a caller will get a busy signal ? ( Hint : Solve for log K or ln K using trial and error .) ( Do not round intermediate calculations . Round your answer to 5 decimal places .) Probability b . What is the probability that a customer will be put on hold ? ( Do not round intermediate calculations .