The Dow Jones Industrial Average, which had a topsy-turvy week, fell 78.19 points or 0.79% to 9,771.85. The Dow, down 2.2% on the week, has fallen in eight of the last 10 sessions. The Nasdaq Index, down 2.8% on Wednesday and up 2.1% on Thursday, shed 55.48 points or 2.79% to 1,930.34. The Nasdaq, off 4.6% for the week, suffered its biggest weekly drop since the terror attacks.