Your firm has a contract to make staff uniforms for a fast-food retailer. The heights of the staff are normally
distributed with a mean of 70 inches and a standard deviation of 3 inches.
a) What percentage of uniforms will have to fit staff shorter than 67 inches, i.e., P(X<67)?
b) What percentage will have to be suitable for staff taller than 76 inches, i.e., P(X>76)?