The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 264.7 and a standard deviation of 67.5. (All units are 1000 cells/jL) Using the empirical rule, find each approximate percentage below a. What is the approximate percentage of women with platelet counts within 1 standard deviation of the mean or between 197.2 and 332.2? b. What is the approximate percentage of women with platelet counts between 62 2 and 467.2