Pewlnternet reported in January of 2014 that 32% of U.S. adults own at least one e-reader, and that 28% of U.S. adults read at least one e-book in the previous year (and thus, presumably, owned an e-reader). Overall, 76% of U.S. adults read at least one book (electronic or otherwise) in the previous year, (http://pewinternet.org/Reports/2014/E-Reading-Update/A-Snapshot-of-Reading-in-America-in-2013/Whos-reading-and-how-a-demographic-portrait.aspx).
a) Explain how these statistics indicate that owning an e-reader and reading at least one book in the previous year are not independent.
b) What's the probability that a randomly selected U.S. adult has an e-reader but didn't use it to read an e-book in the previous year?