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In a normal distribution, approximately what percentage of scores isResearchers want to know how much intelligence varies among students in several elementary schools. They administer

In a normal distribution, approximately what percentage of scores isResearchers want to know how much intelligence varies among students in several elementary schools. They administer an intelligence test to the children in one classroom at each grade level in each elementary school. What should they calculate to determine which school has children with the most consistent intelligence levels? between - 1 standard deviation and + 1 standard deviation

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