A particular group of men have heights with a mean of 178 cm and a standard deviation of 6 cm. Bill had a height of 194 cm.

what is the positive difference between Bill's height and the mean?

how many standard deviations is that [the difference found in part (a)]?

convert Bill's height to a z score.

if we consider "usual" heights to be those that convert to z scores between -2 and 2, is Bill's height usual or unusual?