Stocks ended mixed Friday after the economy didn’t grow as much as hoped and earnings from a handful of big companies failed to rev up investors. Economic growth accelerated to a 2.5 percent annual rate in the first quarter, the government said. That came in, however, below the 3.1 percent forecast. The shortfall reinforced the perception the economy is grinding. Corporate earnings this week have also contained worrisome signs as many firms missed revenue forecasts, even as they reported higher profits. Goodyear Tire slipped after revenue fell short, hurt by lower global sales. The Dow and Nasdaq rose for the week.