U.S. diversified stock funds notched their third straight week of gains, rising 0.62% on average in the week ended May 21. It was also the seventh up week in the past eight. The market traded in a tight range all week, mostly on low volume, as the end of the first-quarter earnings season neared. The S&P 500 hit a couple of new highs. Wednesday the market was down after the Federal Reserve signaled that slow U.S.