Figure 1.
Age distribution with a mean of 38 years, spread out from age 5 to age 70, and symmetrical on both sides of the mean.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.