Most people think that the normal adult body temperature is That figure, based on a 19th-century study, has recently been challenged. In a 1992 article in the Journal of the American Medical Association, researchers reported that a more accurate figure may be Furthermore, the standard deviation appeared to be around Assume that a Normal model is appropriate.

a) In what interval would you expect most people s body temperatures to be? Explain.

b) What fraction of people would be expected to have body temperatures above 98.6°?

c) Below what body temperature are the coolest 20% of all people?