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The mean cost of domestic airfares in the United States rose to an all-time high of $375 per ticket. Airfares were based on the total ticket value, which consisted of the price charged by the airlines plus any additional taxes and fees. Assume domestic airfares are normally distributed with a standard deviation of $100. Use Table 1 in Appendix B.

a. What is the probability that a domestic airfare is $555 or more (to 4 decimals)?

b. What is the probability that a domestic airfare is $245 or less (to 4 decimals)?

c. What if the probability that a domestic airfare is between $310 and $490 (to 4 decimals)?

d. What is the cost for the 3% highest domestic airfares? (rounded to nearest dollar) $ or - Select your answer -more / less

Appendix B: Tables TABLE I CUMULAlivl: PROBABILI ILLS KR l'11L STANDAKU NORMAL DISTRIRUTION Enaries in the table Cunulativ probability z valac. For esumple, o prohablity ls.197 25 0062 0 5 004 004 20 0028 0222 7 0 192 18 0183 1.70 240 2389 238 2327 2296 2266 2236 220 2177 214 ABLE CUMULATIVE PROBABILITIES FOR THE STANDARD NORMAL Cunulbliec mhehilityEris in the tabie probability i. 8044. 02 93 04 5 2 5793 3832 3 1 344898126 004 103 6141 619 21 4 6354 28 6664 T00 13772080 844 6879 L0 8413 8438 8461 .8485 8308 833 53 3 8621 15 9529 2.1 9821 9826 9830 934 .9838 .9846 930 9834 .9857 2.5 .9938 .9940 .9941 .9943 .9945 .9946 .9948 .9949 .9952 2.3 9965 9966 9967 968 9 970 9 972 3 .9974

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