A researcher in industrial relations notices that many men who receive high salaries are tall of stature. She decides to investigate the question whether height is related to salary. She wants to classify a man as tall if he is in the upper 10% of the heights of adult males. If adult male heights are normally distributed with a mean of 68 in. and a variance of 1.44 in.2 , what is the shortest height (to the nearest inch) that this researcher will classify as tall?