求高手教学.我实在弱爆了.数学.SAT数学.SAT. 重点在理解过程,不需要答案.

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求高手教学.我实在弱爆了.数学.SAT数学.SAT. 重点在理解过程,不需要答案.
求高手教学.我实在弱爆了.数学.SAT数学.SAT.

 


重点在理解过程,不需要答案.

求高手教学.我实在弱爆了.数学.SAT数学.SAT. 重点在理解过程,不需要答案.
Because the question was about the number of households,you can ignore the graph at the top.
In the graph at the bottom,find the numbers for 1960 and 1975 (1st and 4th bar)
In 1960,the number was roughly 0.7 million
In 1975,the number was 3.5 million
0.7/3.5 = 1/5
E (8/35 < 1/4) is the closest.