Birth Length and z-Scores, Inverse Babies in the United States have a mean birth length of 20.5 inches with a standard deviation of 0.90 inch.
The shape of the distribution of birth lengths is approximately Normal.
a. Find the birth length at the 2.5th percentile.
b. Find the birth length at the 97.5th percentile.
c. Find the z-score for the length at the 2.5th percentile.
d. Find the z-score for the length at the 97.5th percentile.