Previous studies have suggested that human body temperature is normally distributed with a mean of $\displaystyle {98.6}^{\circ}$ F and a standard deviation of $\displaystyle {0.7}^{\circ}$ F. You sample 100 random humans and find $\displaystyle \overline{{x}}={98.1}^{\circ}$ F. To estimate the typical human's body temperature,we should use: