According to a random sample taken at 12 A. M., body temperatures of healthy adults have a bell-shaped distribution with a mean of F and a standard deviation of F. Using Chebyshev's theorem, what do we know about the percentage of healthy adults with body temperatures that are within standard deviations of the mean? What are the minimum and maximum possible body temperatures that are within standard deviations of the mean? At least nothing% of healthy adults have body temperatures within standard deviations of F. (Round to the nearest percent as needed.)