A company services copiers. A review of its records shows that the time taken for a ser-

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A company services copiers. A review of its records shows that the time taken for a ser- vice call can be represented by a normal random variable with mean 75 minutes and stan- dard deviation 20 minutes.

(a) What proportion of service calls take less than one hour?

(b) What proportion of service calls take more than 90 minutes?

(c) Sketch a graph to show why the answers to parts

(a) and

(b) are the same.

(d) The probability is .I that a service call takes more than how many minutes?

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Statistics For Business And Economics

ISBN: 9780131815957

4th Edition

Authors: Paul Newbold

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Question Posted: Oct 31, 2024 06:00 AM

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A company services copiers. A review of its records shows that the time taken for a ser-

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Statistics For Business And Economics

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