Penetration of Internet in the Wealthiest County

From the Herndon Patch post on the Fairfax County Schools moving more to textbooks online:

FCPS discovered through the pilot that 92 percent of middle school students have computer access at home, .3 percent have no access and 73 percent say they can have access whenever they want it. For high school, the results are 88 percent with access at home, 1.5 percent have no access and 82 percent have access whenever they want it.

I assume there are a few Luddites in this county, but most of the missing 8 percent are children of immigrants who basically rely on the library system.