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Probability and Statistics for Engineers and the Scientists | 9th Edition | ISBN: 9780321629111 | Authors: Ronald E. Walpole; Raymond H. Myers; Sharon L. Myers; Keying E. Ye
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The lengths of power failures, in minutes, are recorded in

Chapter 2, Problem 1.21

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QUESTION:

The lengths of power failures, in minutes, are recorded in the following table. 22 18 135 15 90 78 69 98 102 83 55 28 121 120 13 22 124 112 70 66 74 89 103 24 21 112 21 40 98 87 132 115 21 28 43 37 50 96 118 158 74 78 83 93 95 (a) Find the sample mean and sample median of the power-failure times. (b) Find the sample standard deviation of the powerfailure times.

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QUESTION:

The lengths of power failures, in minutes, are recorded in the following table. 22 18 135 15 90 78 69 98 102 83 55 28 121 120 13 22 124 112 70 66 74 89 103 24 21 112 21 40 98 87 132 115 21 28 43 37 50 96 118 158 74 78 83 93 95 (a) Find the sample mean and sample median of the power-failure times. (b) Find the sample standard deviation of the powerfailure times.

ANSWER:

Q:The lengths of power failures, in minutes, are recorded in the following table.a) Find the sample mean and sample median of the power-failure times. (b) Find the sample standard deviation of the power failure times. Step By Step SolutionStep 1 of 3:a) Find the sample mean and sample median of the power-failure times.The sample mean of the sample is found by the following formula:For a sampleThe mean is given by,Here,n=45Thus the sample mean is 74.02 minutes.

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