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It is known that the time it takes for a caller to speak to a customer...

It is known that the time it takes for a caller to speak to a customer service representative is exponentially distributed with an average value of 28 minutes. Given that the caller has waited 20 minutes already, what is the probability that it will take more than an additional 10 minutes?

Math   Statistics-And-Probability   
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TOPIC:Exponential distribution.

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