a. Complete the above life table including columns 4, 5, 6 and 7 (round to 3 decimal points). Effective number exposed to risk of dying during interval = col 1 - (col 3/2 Proportion who died during interval = col 2 / col 4 Proportion who survived during interval = 1 - probability of dying Cumulative survival = proportion who survived from the point at which they enrolled in the study to the end of the interval Column 1 2 3 4 5 6 7 Year Alive at beginning of interval Died during interval Withdrew during interval Effective number exposed to risk of dying during interval Proportion who died during interval Proportion who survived during interval Cumulative Survival 1 1000 268 0 2 732 104 21 3 607 98 44 4 465 75 27 5 363 34 12