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The following frequency distribution shows the scores on a national achievement test for a group of students. Find the sample standard deviation for the group

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The following frequency distribution shows the scores on a national achievement test for a group of students. Find the sample standard deviation for the group of students. Score Frequency 196.5-217.5 217.5-238.5 238.5-259.5 259.5-280.5 10 280.5-301.5 15 301.5-322.5 6

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