EX-99 3 minn-dak031752_ex99.txt CERTIFICATIONS OF CEO AND CFO EXHIBIT 99 906 CERTIFICATION The undersigned certify pursuant to 18 U.S.C.ss.1350, that: (1) The accompanying Quarterly Report on Form 10-Q for the period ended February 28, 2003, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and (2) The information contained in the accompanying Report fairly presents, in all material respects, the financial condition and results of operations of the Company. Date: April 14, 2003 /s/ David H. Roche ----------------------- President and Chief Executive Officer EXHIBIT 99 906 CERTIFICATION The undersigned certify pursuant to 18 U.S.C.ss.1350, that: (1) The accompanying Quarterly Report on Form 10-Q for the period ended February 28, 2003, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and (2) The information contained in the accompanying Report fairly presents, in all material respects, the financial condition and results of operations of the Company. Date: April 14, 2003 /s/ Steven M. Caspers ---------------------------- Executive Vice President and Chief Financial Officer