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Suppose that 65% of all tax returns lead to a refund. A random sample of 100 tax returns is taken. a. What is the mean of the distribution of the sample proportion of returns leading to refunds? b. What is the variance of the sample proportion? c. What is the standard error of the sample proportion? d. What is the probability that the sample proportion exceeds 0.75? 3 Click the icon to view the standard normal table. a. The mean of the distribution of the sample proportion is D. (Round to two decimal places as needed.)