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The average of first 10 odd numbers is_____________?

Correct answer: B. 10

  • A. 11
  • B. 10
  • C. 12
  • D. 17

Explanation

The first 10 odd numbers are 1 through 19. For an evenly spaced list, the average is the mean of the first and last values: (1 + 19)/2 = 10. The likely mistake is choosing 11 by using the 10th odd number or miscounting the sequence.

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About Averages

An average represents the total of a set of values divided by the number of values, and a weighted average gives different importance to different groups. Problems involve missing values, combined averages, replacement of observations, and changes in the average, so the total and count must be tracked separately.

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