The numbers of minutes that United Airlines flights were delayed are described by the density histogram in Fig. 30 for the 922 United flights that departed from O€™Hare Airport in Chicago during the period December 22€“28, 2013. Some flights were delayed at least 175 minutes, but the bars would not be visible. The data are rounded to the ones place.

a. The minimum observation is -8 minutes. What does it mean in this situation?
b. Find the probability that a flight randomly selected from the 922 flights departed early.
c. Find the probability that a flight randomly selected from the 922 flights departed between 25 and 74 minutes late, inclusive.
d. Find the probability that a flight randomly selected from the 922 flights departed on time OR late. Some of the bars were left blank on purpose.
e. The numbers of minutes that United Airlines flights were delayed are described by the density histogram in Fig. 29 on page 309 for the 1219 United flights that de- parted from O€™Hare Airport in Chicago during the period October 2€“7, 2013. Were flights more delayed during October 2€“7 or during December 22€“28? Explain. If you did Exercise 47, your explanation should include a comparison of your results in parts (a), (b), and (c) of that exercise and your results of parts (a), (b), and (c) of this exercise, respectively.

Transcribed Image Text:

United Airlines Departure Delays during December 22-28, 2013 0.024 0.020 0016t 0.012 0.008 0,004 to.16 0.55 0.16 0,06 -25 0 25 50 75 100 25 150 175 Minutes