Data Sufficiency

[Data Sufficiency] 试题详情

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?
(1)  
(2)  

Options:

Correct:

D

Data Sufficiency

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