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The amount of time travellers at an airport spend with customs officers has a mean of p. : 33 seconds and a standard deviation of
The amount of time travellers at an airport spend with customs officers has a mean of p. : 33 seconds and a standard deviation of J : 13 seconds. For a random sample of 50 travellers, what is the probability that their mean time spent with customs officers will be: Standard Normal Distribution Table a. Over 30 seconds? S Round to four decimal places if necessary b. Under 35 seconds? Round to four decimal places if necessary c. Under 30 seconds or over 35 seconds? Round to four decimal places if necessaryTable 7.2-a Table of Areas under the Standard Normal Distribution below Negative z-scores P(Z s 2) for negative z-scores These tables are also made available for reference in the Appendix on pages 402 and 103. 0.02 0.01 0.00 0.09 0.08 0.07 0.05 0.03 0.0042 0.0902 0.000 0.0501 0.DO01 0.0001 0.0601 0.0001 0.000 0.0001 -3.6 0.0003 0.0002 0 0002 0.6002 -35 0.0002 10 0002 0/0001 0.0002 0.0002 0.0002 10.0003 0.0003 6 0003 04203 0.0003 0.0003 0.0003 6.0002 10 0403 0.0904 0.0005 0.0005 0.0805 6.0004 6.0005 0.0604 0.0004 0.0007 6.0005 0.0006 0.0006 0.0807 0.0006 0.0006 0.0006 0.0005 0.0005 0.0008 0.0009 0.0009 0.0009 0.0010 0.000 0.0004 0.0013 0.0013 0,0013 0.0011 0:0012 0.0013 0.0910 0.0011 0.0011 0.0015 0.0016 0.0016 0.0047 10018 0.0010 0.0014 0.0014 0.0015 0.0023 0.0024 0.0025 0.0036 0.0019 0.0020 0.0021 0.0021 0.0022 0.0013 0.0032 0.0033 0.0034 0.0035 0.0036 0.9027 0.0024 0.0029 0.0030 0.0031 0.0044 0.0045 0.00-47 0.0036 0.0038 6.0039 0.0040 0.00-41 0.00-43 0.0062 0.0051 0.0052 0.0054 0.0055 0.0057 0.0059 0.0060 0.0048 0.0049 0.0069 0.0071 0.0073 0.0075 0 0078 0.0080 0.0082 0,0064 0.0068 0.0091 0.0094 0.0096 0.0099 10102 0,0104 0.0107 0.0084 0,0087 0.0089 0.0430 0.0125 0.0120 101 32 0.0136 0.0110 0.0113 0.01 16 0.0110 0.0121 0.0174 0.0179 0.0146 0.0150 0.0154 0.0158 0.0162 0.0106 0.0170 0.0143 0:0207 0.0212 0.0217 0.0232 0:0228 0.0183 0.0188 0.0192 0.0197 0.0202 0,0362 0.0274 0.0281 0.0187 0.0233 0.0239 0,0244 0.0250 0.0250 0.0322 0/0329 0.0336 60344 0.0351 0.0359 0.0294 0.0301 0.0307 0.0314 90418 60427 0.6136 0.0446 6.0392 0.0101 0.0409 The highlighted 0.0367 0.0375 0.0384 0.0495 0.0505 0.0536 0.0537 0.0548 0.0516 value shows the area -L6 0.0455 0.0465 0.0475 0.0485 0.0630 0.0643 0.0655 1.0658 under the standard 0.0594 normal distribution -15 0.0559 0.0571 0.0582 0.0606 0.0618 0.0749 0.0764 10778 0.0793 below z.score -1.56. 0.0694 0.0721 0.0735 0 068 0.0708 0.0918 10934 0.0951 -13 0.0833 0.0838 0.0853 6.0869 0.0885 0/0901 0.1151 0.1075 0.1093 1.1112 0.1131 -12 0.0985 0.1003 6.1020 0.1038 0.1056 0.1251 0.1271 1292 0.1314 0.1335 0.1357 -1.1 0.1170 0.1190 0.1210 0.1230 1.1515 11530 1.1562 0.1587 0.1379 0.1401 0.1-423 0.14-46 0.1469 0.1492 0.1736 11762 0.1738 0.1814 0.18-41 -0.9 0.1611 0.1635 0.1660 0.1635 0.1711 0.2033 0.2061 0.2090 0.21 19 0.1919 01.2006 0.1867 0.1894 0.1922 0.1977 -0.8 0 1358 0.2389 0.2420 0.2236 0 1266 0.2206 0.2327 -0.7 0.2148 0.217 0.2306 0.2611 0.2643 0.1676 0.2709 0.2743 -0.6 0.2451 0.2453 0.2514 0.2546 0.3083 0.2912 0.2946 13015 0.3060 -05 0.2736 0.2810 0.38-43 0.2877 0.2081 0.3300 0.3336 13372 0 3100 0.3416 0.3121 0.3156 0.3192 0.3228 0.3264 0.3747 0.3783 0.3821 0.3594 10.3631 0.3560 0.3707 -0.3 0.3483 0.3520 0.3537 0.4207 0.3936 10.3974 0.4013 0.4052 0.4090 0.4129 0.4168 -0.2 0.3850 0.3897 14522 0.4563 0.4602 0.4247 0.4286 0.4325 0.4364 0-4404 0413 0.4483 -0.1 0.4920 0.4960 0.5000 -0.0 0.4641 0.4681 6.4721 0.4761 0.4801 0.4840 0.4850 Note: For z s -3.70, use P(Z
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