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^{-Ct}

i know P(t) is the fraction of the group surviving t years or less

now the question is: suppose a patient has a 70% probability of surviving at least 2 years, find C.

to find c i would take the integral of p(t) but what would my limits be? surviving 2 at least 2 years, so thats more than 2 years. would i have my lower limit be 2 and then have my upper limit be infiniti or just a big number?

any help would be appreciated