Question 653592
Greeting Card Art, Inc. is proud of the fact that 93 percent of their calls for assistance are answered directly by a technician who can solve the customer's problem. To monitor this service claim, suppose Greeting Card Art selects a random sample of 25 recent calls. 
A. Explain why this situation fits a binomial distribution.
Independent response on each call.
P(tech answer) = 0.93 for each call
n = 25
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B. What is the probability exactly 20 of the calls are answered directly by a technician?
P(x = 20) = 25C20(0.93)^20*(0.07)^5 = binompdf(25,0.93,20) = 0.0209
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C. What is the probability at least one of the calls is put on hold?
P(1<= x <=25) = 1 - P(x = none put on hold) = 1 - binompdf(25,0.07,0) 
= 0.8370
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Cheers,
Stan H.
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