With a height of 68 in, george was the shortest president of a particular club in the past century. the club presidents of the past century have a mean height of 73.2 in and a standard deviation of 1.3 in. a.what is the positive difference between george's height and the mean? b. how many standard deviations is that [the difference found in part (a)]? c. convert george's height to a z score. d.if we consider "usual" heights to be those that convert to z scores between -2 and 2, is george's height usual or unusual?