suppose x is a binomial random variable that models the number of successes in n trials, where each trial is a success with probability p. the sample proportion of successes p hat is related to the binomial random variable x in that a. P(p _hat = x) = P(X = x)b. P(p_hat = x/n) = P(X = x)c. P(p_hat = n/x) = P(X = x)d. P(p_hat = x) = P(X = x/n)