In his 1868 work, Carl Wunderlich concluded that temperatures above 100.4°

Fahrenheit should be considered feverish. In a 1992 study, Maryland researchers suggested that 99.9° Fahrenheit was a more appropriate cutoff [29]. If the oral temperatures of healthy humans are normally distributed with a mean of 98.23 and a standard deviation of 0.67 (values estimated by the Maryland researchers), what fraction of these readings are above 100.4? Above 99.9?