The time Z in minutes between calls to an electrical supply system has the probability density function

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The time Z in minutes between calls to an electrical supply system has the probability density function
(a) What is the probability that there are no calls within a 20-minute time interval?
(b) What is the probability that the first call comes within 10 minutes of opening?
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Probability & Statistics For Engineers & Scientists

ISBN: 9780130415295

7th Edition

Authors: Ronald E. Walpole, Raymond H. Myers, Sharon L. Myers, Keying

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