The body temperatures of a group of healthy adults have a bell-shaped distribution with a mean of 98.12°F and a standard deviation of 0.51°F. Using the empirical rule, find each approximate percentage below.
a. what is the approximate percentage of healthy adults with body temperatures within 2 standard deviations of the mean, or between 97.20°F and 99.14°F
b. what is the approximate percentage of healthy adults with body temperatures between 96.59°F and 99.65°F?