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Determining the standard deviation

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Test scores. Many states have programs for assessing the skills of students in various grades. The Indiana Statewide Testing for Educational Progress (ISTEP) is one such program.31 In a recent year 76,531 tenth-grade Indiana students took the English/language arts exam. The mean score was 572 and the standard deviation was 51. Assuming that these scores are approximately Normally distributed, N(572, 51), use the 68-95-99.7 rule to give a range of scores that includes 95% of these students.

Reference no: EM131745170

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