A random sample of medical files is used to estimate the proportion p of all people who have blood type b .

A random sample of medical files is used to estimate the proportion p of all people who have blood type b . If you have no preliminary estimate for p, how many medical files should you include in a random sample in order to be 85% sure that the point estimate p(hat) is within a distance of 0.05 from true p? ( please show work)

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