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题目材料：
Notes:
(1) The total population was 260,341,000.
(2) Age-group determined by age, in years, at last birthday.
Which of the following information, if any, together with the information given, is sufficient to determine the average (arithmetic mean) age for the population?
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A.The number of people in each age-group
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B.The average age for each age-group
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C. The median age for each age-group
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D.The median age for the population
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E.No additional information is needed; the information given is sufficient.
B显示答案
