[計量] 請教PowerPrepII(2.0) Test1 Sec3 16題
圖表題
16.
If each of the average ratings was the arithmetic mean of the ratings
given by the 100 travel agents, approximately how much greater was the
total of the ratings given to all three airlines for reliability than
that for promptness?
(A) 25 (B) 50 (C) 125 (D) 250 (E) 500
答案是(D)
請教各位高手有人知道如何解這題嗎？
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