5. Initially, 500 lives, each aged 0, were included in study of time of death. You are given the following information about the study participants at the first five death times. Number of deaths at t Exists in (tfu) 4 22.0 10 2 31.5 3 50.7 51.3 1 35 1 4 1 53.0 (a) Calculate the risk sets at each of the death times, and estimate the conditional and unconditional survival probability estimates up to age 53, using the Kaplan-Meier method. Put your answer in the format of a table with headers. jo d Pu $(), t sI

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