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The mean score for Class 1 is (75+80+84+79+92+86+88+86+86+90)/10 = 83.6.
The mean score for Class 2 is (83+85+91+93+72+85+76+80+82+89)/10 = 83.6.
Since both classes have the same mean score of 83.6, they generally performed equally well on the math test.