can someone explain how to find probabilities with the z score chart

The lengths of pregnancies are normally distributed with a mean of 266 days and a standard deviation of 15 days. a. Find the probability of a pregnancy lasting 307 days or longer b. If the length of pregnancy is in the lowest 2%, then the baby is premature. Find the length that separates premature babies from those who are not premature. Click to view page to be able Click to view page 2 of the table. a. The probability that a pregnancy will last 307 days or longer is (Round to four decimal places as needed.) b. Babies who are born on or before days are considered premature, (Round to the nearest Integer as needed.) -30 -2.9 -28 -27 -26 -25 -2.4 -23 -22 -21 -20 -19 -18 -17 -16 -15 -14 -13 -12 -11 -10 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 0146 VU 0013 .0019 0026 0035 0047 0062 .0082 0107 0139 0179 0228 .0287 0359 0446 0548 0668 0808 0968 1151 1357 1587 1841 2119 2420 2743 3085 3446 3821 4207 Vous 0013 0018 ,0025 0034 0045 0060 20080 0104 0136 .0174 0222 0281 0351 0436 0537 0655 000 0013 0018 0024 0033 0044 10059 0078 0102 0132 0170 0217 0274 0341 0427 0526 0643 0778 0934 1112 1314 1539 1788 2061 2358 2676 3015 3372 3745 4129 000 0012 0017 0023 .0032 .0043 .0057 .0075 .0099 0129 0166 0212 .0268 0336 0418 0516 0630 0764 0918 1093 1292 1515 1762 2033 2327 2643 2981 3336 3707 4090 0000 000 0012 001 0016 .0016 0023 .0022 0031 .0030 0041 1.0040 .0055 .0054" .0073 .0071 0096 .0094 0125 0122 0162 .0158 0207 .0202 0262 0256 0329 ,0322 0409 0401 05050495 0618.0606 .0749 .0735 0901 0885 1075 1056 1271 1251 1492 1469 .1736 1711 2005 1977 2296 2266 2611 2578 2946 2912 3300 3264 3669 3632 4052 4013 DO 0011 0015 .0021 .0029 0039 0052 .0069 0091 0119 0154 0197 0250 0314 0392 0485 0594 0721 0869 1038 1230 1446 1685 1949 2236 2546 2877 3228 3594 3974 ovo 000 0011 0010 .0015 0014 ,0021 .0020 .0028 0027 0038 0037 20051 0049 ,0068 A.0066 .0089 .0087 .0116 on3 0150 0192 .0188 .0244 0239 .0307 .0301 0384 .0375 0475 .0465 .0582 .0571 .0708 0694 0853 0838 1020 -1003 1210 1190 1423 1401 1660 1635 1922 .1894 2206 2177 2514 2483 2843 2810 3192 3156 3557 3520 39.36 3897 000 0010 .0014 0019 0026 0036 0048 .0064 .0084 0110 0143 0183 0233 .0294 0367 0455 0559 0681 0823 0985 1170 1379 1611 1867 2148 0793 0951 .1131 3335 1562 1814 2090 2389 2709 .3050 3409 3783 4168 2451 2776 3121 3483 3859 -024