The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 248.2 and a standard deviation of 64.3. (All units are 1000 cells/L.) Using the empirical rule, find each approximate percentage below. a. What is the approximate percentage of women with platelet counts within 3 standard deviations of the mean, or between 55.3 and 441.1? b. What is the approximate percentage of women with platelet counts between 183.9 and 312.5