AT&T has joined forces with a unit of News Corp. to debut a low-cost tablet computer for educational settings. The tablet -- which is the brainchild of News Corp.'s Amplify division -- runs on Android's "Jelly Bean" operating system, features extended battery life and retails for $299. A premium version with 4G access from AT&T costs $349 and includes Google Apps for Education and Amplify's own education software.