The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 256.3 and a standard deviation of 60.8. (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 73.9 and 438.7? b. What is the approximate percentage of women with platelet counts between 195.5 and 317.1