WASHINGTON (MarketWatch) — Sales of previously owned homes dropped 9.6%  in February and prices fell to their lowest level since 2002, reflecting  a continued slump in the U.S. real estate market.            
The National Association of Realtors on Monday said sales of existing  homes dropped to a seasonally-adjusted annual rate of 4.88 million from  an upwardly revised 5.4 million in January. Economists surveyed by  MarketWatch expected sales to drop to a rate of 5.1 million.