How do I calculate the median survival rate?

after 1 minute of exposure to a chemical, 10/10 subjects survive. after 2 minutes, 10/10 survived. after 3 minutes, 10/10 survived. after 4 minutes 10.10 survive. after 5 minutes, 7 / 10 survive. after 6 minutes, 7 / 10 survive. after 7 minutes, 2 / 10 survive. after 8 minutes, 2 / 10 survive. after 9 minutes, all are dead. is taken up after 13 minutes of exposure. How do I calculate the average survival rate?

Good question

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