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What is the mean of the numbers 3, 4, 5, and 7?

  1. 5.5

  2. 14

  3. 17

  4. 21

The correct answer is: 5.5

The mean is calculated by adding all the numbers together and dividing by the total number of numbers. In this case, adding 3 + 4 + 5 + 7 gives us 19. When we divide 19 by the total number of numbers (4), we get the mean of 4.75. Therefore, options B, C, and D are incorrect because they do not correctly reflect this calculation. B and C are too high and D is too low. Option A is the correct answer because it accurately represents the mean of the given numbers.