NY -- Standard&Poor's CreditWire 11/18/98 –- Standard&Poor's today assigned its double-'A'-minus rating to Florida State Board of Regents' $51.02 million university system improvement bonds series 1998 issued for Florida State University System. In addition, Standard&Poor's affirmed its double-'A'-minus rating on the regents' outstanding university system improvement revenue refunding bonds series 1997 issued for Florida State University System. The outlook is stable. The rating on the bonds reflects: -- A total enrollment exceeding 213,000 students; -- The system's breadth and diverse academic offerings; -- Strong state support; and -- Low debt burden. The bonds are secured on parity with $160 million of revenue bonds, most of which is also secured by bond insurance. Security is