What is the mode of 18, 18, 15, 18, 18, 24, 21, 21, 24, and 14?

Count how many times each number appears. The number 18 appears four times; 21 and 24 each appear twice, and 15 and 14 appear once. Since 18 occurs more often than any other number, the mode is 18, choice A.

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