ANSWER TO FRAME 66.
The area of interest is shaded:
We found the area under the curve from 175cm to 180cm is .2967. The number of standard
deviations from the mean to 191cm is
z = X - u = 191 - 175 = 16 = 2.67
This corresponds to an area of .4902. So the area from 180cm to 191cm is .4962 - .2967 = .
We would expect 19.95% of the recruits to require Size O.