-3.50 and lower 0001 -3.4 .0003 0003 .0003 0003 .0003 .0003 0003 .0003 .0003 .0002 -3.3 .0005 .0005 0005 0004 .0004 .0004 0004 .0004 .0004 .0003 -3.2 .0007 .0007 .0006 .0006 0006 .0006 0006 .0005 .0005 .0005 -3.1 .0010 .0009 .0009 .0009 .0008 ,0008 0008 .0008 .0007 .0007 -3.0 .0013 .0013 0013 0012 .0012 .0011 0on1 0011 .0010 .0010 -2.9 .0019 .0018 .0018 .0017 .0016 .0016 _0015 .0015 .0014 .0014 -2.8 .0026 .0025 .0024 .0023 .0023 .0022 0021 .0021 .0020 .0019 -2.7 .0035 .0034 .0033 .0032 .0031 .0030 0029 .0028 .0027 .0026 -2.6 .0047 .0045 .0044 .0043 .0041 .0040 0039 .0038 .0037 .0036 -2.5 .0062 .0060 .0059 0057 .0055 .0054 .0052 .0051 * 0049 .0048 -2.4 .0082 .0080 .0078 .0075 .0073 .0071 .0069 .0068 .0066 .0064 -2.3 .0107 0104 0102 0099 .0096 .0094 0091 .0089 .0087 .0084 -2.2 .0139 .0136 .0132 .0129 .0125 .0122 0119 .0116 .0113 .0110 -2.1 .0179 .0174 .0170 .0166 .0162 .0158 .0154 .0150 .0146 .0143 -2.0 .0228 0222 .0217 .0212 .0207 .0202 0197 .0192 .0188 .0183 -1.9 .0287 .0281 .0274 .0268 .0262 .0256 .0250 .0244 0239 .0233 -1.8 .0359 .0351 .0344 .0336 .0329 .0322 0314 .0307 .0301 .0294 -1.7 .0446 .0436 .0427 .0418 .0409 .0401 0392 .0384 .0375 .0367 -1.6 .0548 .0537 0526 .0516 0505 * .0495 0485 .0475 .0465 .0455 -1.5 .0668 .0655 0643 .0630 .0618 .0606 0594 .0582 .0571 .0559 -1.4 .0808 .0793 .0778 .0764 .0749 .0735 .0721 .0708 .0694 .0681 -1.3 .0968 .0951 0934 .0918 .0901 .0885 0869 .0853 .0838 .0823 -1.2 .1151 .1131 .1112 1093 .1075 .1056 1038 .1020 .1003 .0985 -1.1 .1357 .1335 1314 .1292 .1271 .1251 .1230 .1210 1190 .7170 -1.0 .1587 .1562 1539 1515 .1492 .1469 .1446 .1423 1401 .1379 1841 1814 17RR 1762 1736 1711 1685 1660 1635 16111.4 .9192 9207 9222 9236 .9251 -9265 .9279 9292 9306 .9319 1.5 .9332 9345 9357 9370 .9382 .9394 .9406 9418 .9429 .9441 1.6 .9452 9463 9474 .9484 .9495 .9505 .9515 9525 .9535 .9545 1.7 .9554 .9564 .9573 9582 .9591 .9599 .9608 9616 .9625 .9633 1.8 .9641 .9649 .9656 9664 .9671 .9678 .9686 9693 9699 .9706 1.9 9713 .9719 .9726 9732 9738 .9744 .9750 9756 .9761 9767 2.0 9772 .9778 .9783 9788 .9793 .9798 .9803 9808 .9812 .9817 2.1 9821 .9826 .9830 9834 9838 9842 .9846 9850 .9854 9857 2.2 9861 9864 9868 .9871 .9875 .9878 .9881 .9884 .9887 9890 2.3 9893 .9896 .9898 .9901 .9904 .9906 .9909 .9911 .9913 9916 2.4 .9918 .9920 .9922 .9925 .9927 .9929 .9931 9932 .9934 .9936 2.5 9938 9940 9941 9943 .9945 9946 .9948 9949 .9951 .9952 2.6 9953 .9955 .9956 9957 9959 9960 .9961 9962 .9963 9964 2.7 .9965 .9966 9967 .9968 .9969 .9970 .9971 9972 9973 .9974 2.8 .9974 .9975 .9976 .9977 .9977 9978 .9979 9979 .9980 .9981 2.9 .9981 .9982 .9982 .9983 .9984 .9984 .9985 9985 .9986 .9986 3.0 .9987 .9987 9987 9988 .9988 .9989 .9989 .9989 .9990 .9990 3.1 9990 .9991 .9991 9991 .9992 .9992 .9992 9992 .9993 9993 3.2 9993 9993 9994 9994 .9994 .9994 .9994 9995 .9995 9995 3.3 9995 .9995 .9995 9996 9996 .9996 .9996 9996 9996 .9997 3.4 .9997 .9997 9997 9997 .9997 .9997 .9997 9997 .9997 .9998 3.50 .9999 and up NOTE: For values of z above 3.49, use 0.9999 for the area. Common Critical VThe lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. a. Find the probability of a pregnancy lasting 309 days or longer. b. If the length of pregnancy is in the lowest 4%, then the baby is premature. Find the length that separates premature babies from those who are not premature. Click to View page 1 of the table. Elfin Wiia