The blood platelet counts of a group of women have abell-shaped distribution with a mean of 248.6 and a standard deviation of 65.7. (All units are 1000 cells/mu μL.) 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 51.5 and 445.7?
b. What is the approximate percentage of women with platelet counts between 117.2 and 389.4?