A committee of the University of Massachusetts board of trustees on Feb. 20 approved a 15 percent increase in student fees. That would bring annual tuition for in-state undergraduates to an average of $11,000. The fee increase is likely to be approved by the full board, which meets Feb. 27 in Dartmouth, Mass., near Providence, R.I. (The board generally meets in Amherst only in summer, when most students are away. Amherst has far more students than the other UMass campuses.)