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[Data Sufficiency]
试题详情
题目：
A total of 20 amounts are entered on a spreadsheet that has 5 rows and 4 columns; each of the 20 positions in the spreadsheet contains one amount. The average (arithmetic mean) of the amounts in row i is 
.The average of the amounts in column j is 
. What is the average of all 20 amounts on the spreadsheet?
.The average of the amounts in column j is . What is the average of all 20 amounts on the spreadsheet?(1) 
(2) 
选项:
答案:
D
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