Consider the following. (Give your answers correct to two decimal places.)
a) Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.3982.
b) Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.4714.
c) Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.3719.