Follow-up Time (Months)	Event	Probability of death at the exact time when the death occurred	Probability of survival beyond the point when the death occurred	Cumulative probability of survival beyond the time when death occurred
2
8
15
17
19
23

IV. What is the cumulative survival probability at the end of the follow-up? (2 points)

V. What is the simple proportion of individuals apparently surviving (i.e., not observed to die) through the end of the study's observation period? (2 points)

VI. Why are the simple proportion of surviving and the cumulative probability of survival different? (5 points)