Help with this challenge questions below.the questions are complete

Example 2.1.1. The following data refer to certain lives with cystic fibrosis in North America. age number central crude central of exposed rate of mortality deaths to risk I 20 507.6 .03940 21 917.3 02289 20 1067.5 .01874 30 1157.9 .02591 41 1222.3 .03354 34 1227.2 .02771 34 1204.5 .02823 46 1173.7 .03919 59 1150.9 .05126 51 1104.1 .04619 44 1077.9 .04082 41 1094.1 .03747 54 1056.1 .05113 48 1019.9 .04706 40 945.4 .04231 52 865.6 .06007 40 766.5 .05219 56 683.3 .08196 30 569.0 .05272 42 470.5 .08927 29 407.4 07118 27 357.9 .07544 16 313.4 .05105 15 277.5 .05405 251.9 .07940 13 190.6 .06821 146.7 .06135 8 113.5 .07048 85.9 .08149 64.5 .06202 50.5 .05941 31 32.8 12195 Source: Report of the Patient Registry, 1978, Cystic Fibrosis Foundation, Rockville MD, U.S.A Find an approximate 95% confidence interval for the true central death rate at age 20.Example 2.5.1. The following table is taken from a study of impaired lives conducted by a large life office. Impairment Nature of impairment Actual Expected number deaths deaths Arteriosclerosis or Atheroma 25 23.9 Hypertension, entry ages under 40 33 18.2 Hypertension, entry ages 40-59 246 145.5 Standard weight, S.A.P. 155-170, D.A.P.