2.44 A major airport recently hired consultant John Cadariu to study the problem of air traffic delays.

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2.44 A major airport recently hired consultant John Cadariu to study the problem of air traffic delays. He recorded the number of minutes planes were late for a sample of flights in the following table:

Minutes late 0 6 10 10 6 20 20 6 30 30 6 40 40 6 50 50 6 60 Number of flights 30 25 13 6 5 4

a. Estimate the mean number of minutes late.

b. Estimate the sample variance and standard deviation.

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Statistics For Business And Economics

ISBN: 9780273767060

8th Global Edition

Authors: Paul Newbold, Mr William Carlson, Ms Betty Thorne

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