sentence: Mark Sarvary and Frank Castelli studied why a majority of students — 90% of the 276 students they surveyed — kept their video cameras off during class. More than 41% of students said it was because they were concerned about their appearance.
modified: fix grammar: Mark Sarvary and Frank Castelli studied why a majority of students — 90% of the 276 students they surveyed — kept their video cameras off during class More than 41% of students said it was because they were concerned about their appearance