I need help with questions a, b & c.

The mean cost of domestic airfares in the United States rose to an all-time high of $390 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 $115. 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 $240 or less (to 4 decimals)? c. What if the probability that a domestic airfare is between $310 and $480 (to 4 decimals)? d. What is the cost for the 4% highest domestic airfares? (rounded to nearest dollar) 591.80 or more .00 .01 02 103 4 05 06 07 .08 .00 -30 10013 0013 0013 20012 10012 0011 0011 0011 0010 0010 -29 -28 -27 -26 -25 .0019 20026 10035 0047 0062 .0018 0025 .0034 20045 20060 20018 .0024 .0033 0044 20059 0017 .0023 20032 .0043 .0057 10016 0023 0031 20041 .0055 10016 0022 0030 0040 0054 0015 0021 .0029 0039 20052 0014 0020 0027 0037 0049 0014 0019 0026 0036 .0048 0015 10021 .0028 .0038 0051 20068 20089 0116 .0150 .0192 -24 -23 -22 -21 -20 0082 .0107 0139 20179 0228 0080 20104 20136 20174 0222 20078 .0102 20132 20170 0217 20075 20099 0129 0166 0212 .0073 20096 20125 0162 0207 0071 20094 20122 20158 10202 0069 0091 0119 .0154 .0197 0066 0087 20113 20146 .0188 0064 20084 0110 20143 0183 -19 -1.8 -17 -16 -15 10287 .0359 0446 0548 0668 0281 0351 0436 0537 10655 0274 .0344 .427 .0526 .0643 10268 10336 0418 0516 0630 10262 0329 10409 10505 0618 10256 0322 0401 0495 0606 0250 0314 0392 0485 0594 0244 .0307 0384 475 10582 0239 0301 0375 0465 0571 0233 .0294 0367 0455 0559 -14 -13 -12 -11 -10 10808 0968 1151 1357 1587 0793 0951 1131 1335 1562 0778 0934 1112 1314 1539 0764 0918 1093 1292 1515 10749 0901 1075 1271 1492 0735 0885 1056 1251 1469 0721 1.0869 1038 1230 1446 0708 0853 1020 1210 .1423 0694 0838 1003 1190 1401 0681 0823 0985 170 1379 9 -8 -7 -6 -5 1841 2119 12420 12743 13085 1814 12090 12389 12709 13050 1788 12061 12358 12676 13015 1762 2033 12327 12643 12981 1736 12005 12296 12611 12946 1711 1977 12266 12578 12912 1685 1949 2236 2546 2877 1660 1922 12206 12514 12843 1635 1894 12177 1.2483 2810 1611 1867 12148 12451 12776 -4 -3 - -1 -0 3446 13821 14207 4602 5000 3409 3783 4168 14562 14960 13372 3745 4129 452 4920 13336 13707 4090 4483 4880 13300 3669 14052 43 4840 3264 13632 4013 4404 4801 3228 3594 13974 4364 4761 3192 13557 3936 4325 4721 3156 3520 3897 .4286 4681 3121 13483 13859 4247 4641 .00 01 02 03 04 05 106 07 08 .09 0 1 12 3 4 S000 5398 5793 6179 6554 15040 5438 5832 6217 .6591 15080 5478 5871 6255 6628 5120 5517 5910 6293 6664 5160 5557 5948 6331 .6700 5199 5596 5987 6368 6736 5239 15636 6026 6406 6772 5279 5675 6064 6443 6808 5319 5714 6103 .6480 6844 5359 5753 6141 .6517 6879 5 6 7 3 9 915 1.7257 17580 17881 18159 16950 17291 7611 7910 18186 6985 7324 1.7642 7939 18212 7019 7357 7673 7967 18238 17054 7389 774 17995 18264 7088 17422 17734 8023 8289 17123 7454 17764 18051 18315 17157 17486 7794 18078 1.8340 7190 7517 1.7823 18106 18365 7224 7549 17852 18133 .8389 10 11 12 13 14 8413 8643 18849 9032 9192 18438 18665 18869 19049 19207 18461 8686 18888 19066 9222 18485 8708 18907 19082 9236 8508 8729 18925 9099 9251 1.8531 8749 18944 9115 9265 18554 18770 18962 9131 9279 18577 18790 18980 9147 19292 18599 8810 18997 9162 9306 18621 18830 19015 9177 9319 15 16 17 18 19 9332 19452 9554 9641 9713 9345 9463 19564 9649 9719 9357 19474 9573 9656 19726 19370 9484 19582 19664 9732 9382 9495 9591 9671 19738 19394 19505 19599 9678 19744 9406 9515 19608 19686 9750 9418 19525 19616 19693 9756 9429 9535 19625 19699 19761 9441 9545 19633 9706 9767 20 21 22 23 24 9772 9821 19861 9893 9918 9778 9826 19864 19896 19920 9783 19830 19868 19898 19922 9788 9834 9871 19901 19925 9793 9838 19875 9904 19927 9798 9842 19878 19906 9929 19803 19846 19881 9909 19931 19808 19850 19884 19911 19932 19812 9854 19887 19913 9934 9817 9857 19890 9916 19936 2.5 2.6 27 28 29 19938 19953 9965 9974 9981 19940 19955 19966 9975 19982 19941 19956 19967 19976 19982 19943 19957 19968 19977 19983 19945 19959 9969 9977 19984 19946 19960 19970 19978 19984 19948 19961 19971 19979 19985 19949 19962 9972 19979 19985 19951 19963 19973 9980 19952 19964 19974 19981 9986 9986 30 19987 19987 19987 19988 19988 19989 19989 19989 19990 9990