Dow Jones industrial average up 6.80 points, closing at 3,741.84 . . . N.Y.S.E.'s composite index up 0.48 to 250.72 . . . NASDAQss stock- market composite index fell 0.63 to 716.05 . . . American Stock Exchange rose 0.61 to 434.06 . . . Gold fell $0.10 to $384.90 on the Commodity Exchange in New York City. . . The 30-year Treasury bond closed with a yield of 7.52 percent down from 7.56 late Friday.