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4570-4430=140 4800-4240=560 5920-5360=560 140+560+560=1260 mean=1260/3=420

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โˆ™ 2008-07-20 23:26:11
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Q: What is the meanaverage increase in the number of students for these three schools 4430 to 4570 4240 to 4800 and 5360 to 5920?
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