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Telephone calls arrive at the information desk of a large computer software company at a rate of 15 per hour. Assume time between arrivals of

Telephone calls arrive at the information desk of a large computer software company at a rate of 15 per hour. Assume time between arrivals of calls is exponentially distributed. What is the probability that the next call will take longer than 20 minutes to arrive?

a.0.0067

b.0.1011

c.0.1711

d.0.2101

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