Tablet ownership is increasing among college students and high school seniors, according to a survey released by the Pearson Foundation. Among college students, ownership is now 25 percent, up from 7 percent a year ago. Among high school seniors, the figure is now 17 percent, up from 4 percent. A majority of college students (63 percent) and high school seniors (69 percent) believe that tablets will effectively replace textbooks within five years. The survey was conducted in January by Harris Interactive. More than 1,200 college students and 200 college-bound high school seniors responded.