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What is the median of the set of integers {2,5,8,9,12,13}?

  1. 8

  2. 9

  3. 10

  4. 11

The correct answer is: 9

The median is the middle value when all the numbers in a set are arranged in ascending or descending order. Therefore, the median of {2,5,8,9,12,13} is the middle value, which is 9. Option A is incorrect because it is the mean (average) of the set and not the median. Option C and D are incorrect because they do not fall in the middle of the set when arranged in ascending order.