Tokyo stocks edged down Friday amid a cautious mood ahead of U.S. jobs data for May due later in the day that could provide clues on the timing of prospective interest rate cuts by the Federal Reserve. The 225-issue Nikkei Stock Average ended down 19.58 points, or 0.05 percent, from Thursday at 38,683.93. The broader Topix index finished 2.20 points, or 0.08 percent, lower at 2,755.03. On the top-tier Prime Market, decliners were led by electric power and gas, transportation equipment and securities house issues. The U.S. dollar fell to the lower 155 yen range in late afternoon after trading n…