A theater company determines that nationally 72% of adults saw a movie in the theater in the past year. Consider a random sample of 70 adults: a.) Determine the mean and standard deviation of the sampling distribution of the sample proportion, p. Op (Round to 3 decimal places.) b.) Find the probability that at least 50 adults in the sample saw a movie in the past year. (Round all values to 3 decimal places.) P(X 2 50) = P(p >