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The mean cost of domestic airfares in the United States rose to the airlines plus any additional taxes and fees. Assume domestic airfares are normally distributed with a standa a. What is the probability that a domestic pirfare is $560 or more (to 4 declmals)? an all-time high of $400 per ticket. Airfares were based on the total ticket value, which consisted of the price charped by deviation or $100. Use Table i in Appendix B. b. What is the probablity that a domestic airfare is $250 or less (to 4 decimals)? c. What if the probability that a domestic airfare is between $300 and $500 (to 4 decimals)? d, what is the cost for the 4% highest domestic airfares? (rounded to nearest dollar Hide Feedback Partially Correet
TABLE 1 CUMULATIVE PROBABILITIES FOR THE STANDARD NORMAL DISTRIBUTION Entries in the table give the area under the curve to the left of the Cumulative value. For example, for -85, the cumulative probability is.1977 01 -3,0 .0013 .0013 .0013 .0012 .0012 .0011 .0011 .0011 .0010 .0010 29 0019 0018 018 0017 016 0016 0015 0015 0014 0014 -28 0026 0025 0024 0023 0023 0022 0021 0021 002 0019 -27 003s 0034 0033 0032 003 0030029 0028 0070026 -26 0047 004 0044 0043 00004 0039 00380037 0036 -25 .0062 .0060 .0059 .0057 .0055 .0054 .0052 .0051 .0049 0048 -24 0082 0000078 0075 0073 007 0069 0068 0066 0064 -23 0107 0104 0102 09 000094 0 0089 0087 004 -22 .01 39 ΟΙ 36 .or32 0129 .0125 0122 .01 19 .0116 .0113 .01 io -21 .0179 .0174 .0170 0166 D162 058 .0154 .0150 .0146 .0143 -20 0228 0222 0217 0212 02 20 0197 0192 01s8 0183 -1.9 10287 .0281 10274 0268 m62 . 0250 0244 0239 0233 -18 0359 035103440336 0329 0322 0314 0307 0301 0294 -1.7 0446 0436 0427 0418 0490392 0384 0375 0367 -16 0548 05370526 0516 050S 04950485 0475 0465 -15 0668 065S 0643 0630 0618 06060594 0582 0571 0559 0793 0778 0764 0749 0735 0721 0708 0694 0681 -14 0808 0793 07780764 0749 0735 0721 -13 0968 0951 09340918 0901 088S 12 1151 0838 0823 1131 1112 1093 1075 1056 1038 1020 1003 0985 -1.1 1357 1335 1314 1292 127 1251 1230 1210 1190 1170 -1,0 .1587 .1562 .เ539 .เ515 .1492 .1469 .1446-1423 ,1401 .1379 -9 1841 18141788 1762 1736 1711 1685 -.8 .2119 .2090 .2061 3033 ans .เ977 .1949 .1922 7 2420 2389 2358 2327 2296 2 6 2743 27092 - 30853050 3015 2981 2946 2266 2236 2206 2177 2148 2676 2643 2611 2578 2546 2514 2483 2451 2912 2877 2843 2810 2776 3264 3228 3192 3156 3121 3 3821 3783 3745 37073669 3632 3594 3557 35z0 -1 4602 4562422 483 4443 440 4 4090 4052 4013 3974 3936 3897 38s9 4364 4325 4286 4247 - 5000 4960 920 48S0 4840 4S01 4761 4721 46814641
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a) Probability that a domestic air ba is6o o moye ic = P(Z>1.6) ニ1-0.gf52 , | Pix > 56 o): 0.0598 by Probabilit구 that a domestic air lan İs $250 or, less is, = P (z <-1.5) PX S2500 066 3 ー< 500-400 1 00 z 0 8443-0-1587 二 0.6827 P (3004 x500)0 6827

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