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What is the median of the set of numbers 2, 5, 4, 1, 9, 7?

  1. 5

  2. 4

  3. 6

  4. 7

The correct answer is: 5

The median of a set of numbers is the middle value when the numbers are arranged in order from smallest to largest. In this set, the numbers are already arranged in order so it's easy to find the middle value. Since there are six numbers in the set, the middle value will be the average of the two middle numbers, which are 4 and 5. The average of 4 and 5 is 4.5, so that is the median of the set. Option B (4) is incorrect because it is the smallest number in the set, not the middle value. Option C (6) is incorrect because it is the average of the largest and smallest numbers in the set, which is not the definition of median. Option D (7) is incorrect because it is the second largest number in the set, not the middle value.