David is paid on a graduated commission scale at Nooter Company. He receives 2% commission on the first $20,000, 6% on sales from $20,000 to $70,000, 8.5% commission on sales from $70,000 to $100,000, and 10% commission on sales over $100,000.
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Linda received the following scores on her essay tests. 64, 65, 63, 66, 60, 65, 66, 68, 69, 66, 63 How many modes does this set of scores have?
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