P245 CEEFAX 245 Thu 7 Oct 21:20/47    WALL STREET    (Midday): Blue chips remained mixed to lower as investors held back in anticipation of Friday's data on September unemployment and concern over possible disappointments from third-quarter earnings. The Dow remained caught in a tight trading band, with declines leading advances by nine to eight. * US weekly jobless claims fell to 320,000, after 329,000 in the week previously. US wholesale sales rose 1.1% in August (+0.9) in July)  World indices 243 Dow Jones 242 Euro/East Dow Jones Exchanges World Ind