The national? freshman-to-sophomore retention rate has held steady at? 74%. a certain college has 477477 of the 587587 freshman return as sophomores. does this college have a right to brag that it has an unusually high retention? rate?

Yes this college may take credit for having an unusually high retention rate since the 477477/587587 = 81.3% or 7.3% higher than the national average so in other words 81.3% of the freshmen return as sophomores giving this college a good name.