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If the phone calls from a central are made in a Poisson process ( N(t), t≥ 0 ), in average every 10 minutes they have one phone call.

calculate the probability that no call is received in the range ( 0 to 10 minutes ), and exacly one call between 10 and 15 minutes.

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    This is a duplicate of several questions on this site. It would do you good to search for them. – 2012-01-04
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    This is just plugging numbers into the standard formula. – 2012-01-04

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