(a) To make a boxplot of a distribution, you must know A. the five-number summary. B. all of the individual observations. C. the mean and the standard deviation, D. None of the above. (b) What percent of the observations in a distribution lie between the first quartile and the third quartile? OO A. 50%. B. 75%. C. 25%. D. None of the above. (c) If a distribution is skewed to the right, A. the mean is greater than the median. B. the mean and median are equal. C. the mean is less than the median. D. None of the above.