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The following chart shows the distribution of exam grades for a sample of 78 students in a statistics course. The class intervals are 20 to

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The following chart shows the distribution of exam grades for a sample of 78 students in a statistics course. The class intervals are 20 to under 30, 30 to under 40, and so on. Class frequencies are displayed on the bars. 17 13 11 12 12 Frequency 6 20 30 40 50 60 70 80 90 100

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