ExplanationOf the 20 oldest employees, 18 are in the 55–64 age-group, and 2 are in the 45–54 age-group. Therefore the youngest of the 20 employees is in the 45-54 age-group, and the oldest is in the 55- 64 age-group. The youngest of the 20 employees could be 45 years old and the oldest could be 64 years old. In this case, the range of their ages would be 64 – 45, or 19 years.

On the other hand, the youngest could be 54 years old and the oldest could be 55 years old, so the range of their ages would be 1 year. Because there are cases where the range is greater than 11 years and cases where it is less than 11 years, the correct answer is

Choice D.

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Sandy

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