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Test scores of 1000 students were found to have a mean and a standard deviation of 500 and 100 - respectively. If the distribution of scores is bell-shaped - the number of scores that fall in the interval 400 to 600 is approximately

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Test scores of 1000 students were found to have a mean and a standard deviation of 500 and 100 - respectively. If the distribution of scores is bell-shaped - the number of scores that fall in the interval 400 to 600 is approximately






 
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