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Following are the percentages of on-time arrivals for June 2017 by the 21 reporting airlines. 92.2...

Following are the percentages of on-time arrivals for June 2017 by the 21 reporting airlines. 92.2 79.9 68.5 64.9 60.1 76.3 67.6 63.4 77.9 74.6 67.4 59.3 77.8 74.3 67.3 58.8 77.3 72.9 65.7 79.5 63.2

(a) Construct frequency and relative-frequency distributions of the data, using cutpoint grouping with classes of equal width 5 and a first lower class cutpoint of 55. (7%)

(b) Determine the quartiles for the given data. Interpret the results.

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