The duration of telephone calls in a certain city is measured by a random variable X with

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The duration of telephone calls in a certain city is measured by a random variable X with probability density function


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where x denotes the duration (in minutes) of a randomly selected call.


a. What is the probability that a randomly selected call lasts between 2 and 3 minutes?


b. What percentage of the calls can be expected to last 2 minutes or less?


c. What percentage of the calls can be expected to last more than 2 minutes?


d. How long would you expect a randomly selected call to last?

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Calculus For Business, Economics And The Social And Life Sciences

ISBN: 9780073532387

11th Brief Edition

Authors: Laurence Hoffmann, Gerald Bradley, David Sobecki, Michael Price

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