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31) The time between telephone calls to cable television payment processing center follows an [exponential distribution]...

31) The time between telephone calls to cable television payment processing center follows an [exponential distribution] with a mean of 1.5 min. Find probability that the time between the next two calls will be:
a) 45 second or less?
b) Greater than 112.5 sec?
Math   Statistics-And-Probability   
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