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The time between each two successive arrivals made to a bank branch is exponentially distributed with a mean of 10 minutes.If 4 minutes have already

The time between each two successive arrivals made to a bank branch is exponentially distributed with a mean of 10 minutes.If 4 minutes have already passed after the last customer's arrival, what is the probability that a further 5 minutes will elapse before the next customer arrival (i.e., the next customer arrives after 9 minutes)?

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