The stock market was mixed on Friday as investors mulled the end of a strong first quarter of 2017. The Dow Jones Industrial Average declined 65 points today, or 0.3%, leaving the widely followed index up 4.6% for the quarter. The S&P 500 declined by a similar margin, bringing its first-quarter return to 5.5%, and the Nasdaq closed roughly even today to end up 9.8% over the past three months.