I think it would be 'After drumming on his desk, Stewart was disciplined by Mrs. Hobson for distracting students from their exams.'
Answer:They noticed kids who were better starting off were the ones to practice/study more. Theynoticed the kids who needed more practice were the ones to keep practicing less. The better students kept practicing and making themselfs better. Paragraph 3 says ´´Everyone from all three groups started playing at roughly the same age, around five years old. In those first few years, everyone practiced roughly the same amount, about two or three hours a week. But when the students were around the age of eight, real differences started to emerge. The students who would end up the best in their class began to practice more than everyone else: six hours a week by age nine, eight hours a week by age twelve, sixteen hours a week by age fourteen, and up and up, until by the age of twenty they were practicing´´
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