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The set of grades from different classes is recorded. In the first class, the mean is 80 and the standard deviation is 2. In the second class, the...

The set of grades from different classes is recorded. In the first class, the mean is 80 and the standard deviation is 2. In the second class, the mean is 70 and the standard deviation is 5. In the third class, the mean is 72 and the standard deviation is 4. In which class are the grades most dispersed

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