The average of first five multiples of 3 is____________?
Correct answer: B. 9
- A. 3
- B. 9
- C. 12
- D. 15
Explanation
The first five multiples of 3 are 3, 6, 9, 12 and 15. Their sum is 45, and their average is 45 / 5 = 9. A student may choose 12 by selecting the middle or a later multiple instead of dividing the total by the five numbers.
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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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