The lengths of telephone calls can be modeled by an
Chapter 4, Problem 4.2.10(choose chapter or problem)
The lengths of telephone calls can be modeled by an exponential distribution with parameter =0.3 per minute, with the call lengths being independent. What is the probability that out of ten telephone calls, two will be shorter than 1 minute, four will last between 1 minute and 3 minutes, and the other four will last longer than 3 minutes?
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