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.)