Civil Service Exam Reviewer · Averages · easy

What is the average of all whole numbers from 10 to 19, inclusive?

1. 15
2. 145
3. 14.5
4. 9.5

Answer

C. 14.5

Solution

For consecutive numbers, the average is (first + last)/2 = (10 + 19)/2 = 14.5.

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