For a binomial experiment with successes out

For a binomial experiment with successes out of n
r trials, what value do we use as a point estimate for the probability of success p on a single trial? (Enter a mathematical expression.)
p^ =
What is the minimal sample size needed for a 95% confidence interval to have a maximal margin of error of 0.1 in the following scenarios? (For each answer, enter a number. Round your answers up the nearest whole number.)
(a)a preliminary estimate for p is 0.36
(b)there is no preliminary estimate for p
 
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