A large airport records the percentage of airline flights that land no later tha

Question

A large airport records the percentage of airline flights that land no later than 15 minutes after scheduled arrival. The average of these percentages for 12 months last year was 71.7%. These data become available as soon as feasible. However, the airlines can provide preliminary results by obtaining a sample. The accompanying data contains the sample data indicating the number of minutes after scheduled arrival time that the aircraft arrived. Note that a negative entry indicates the minutes earlier than the scheduled arrival time that the aircraft arrived. Complete parts a through c below Click the icon to view the table of arrival times. a. Calculate the proportion of sampled airline flights that landed within 15 minutes of scheduled arrival (Round to three decimal places as needed.)

Explanation / Answer

Total number of observations = 125

Total number of observations that are (>= 15) = 37

Proportion of flights arriving within 15 mins of ETA = 1 - (37/125) = 0.704

[ If we count all the 15s as flights arriving within 15, proportion = 1 - (32/125) = 0.744 ]

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