30. Achievement Tests Mathematics achievement test scores for 400 students had a mean and a variance equal
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30. Achievement Tests Mathematics achievement test scores for 400 students had a mean and a variance equal to 600 and 4,900, respectively. If the distribution of test scores was mound-shaped, approximately how many scores would fall in the interval 530 to 670? Approximately how many scores would fall in the interval 460 to 740?
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Related Book For 
Introduction To Probability And Statistics
ISBN: 9780357114469
15th Edition
Authors: William Mendenhall Iii , Robert Beaver , Barbara Beaver
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