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  3. For how many of the seven years shown was the revenue per student less than 1/5 of the per capita income for the year?

For how many of the seven years shown was the revenue per student less than 1/5 of the per capita income for the year?

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问题 For how many of the seven years shown was the revenue per student less than 1/5 of the per capita income for the year?
选项 A、One
B、Two
C、Three
D、Four
E、Five
答案E
解析 For most of the years, a rough estimate of - of the per capita income is sufficient for the comparison to the revenue per student. For the years 1930, 1940, 1950, and 1960, you might estimate - of the per capita incomes as $1,300, $1,400, $2,000, and $2,500, respectively, which are clearly greater than the corresponding revenues per student.
For 1980 and 1990, your estimates might be $4,000 and $5,000, which are less than the corresponding revenues per student.
For 1970, you do have to calculate= $3,468, which is greater than $3,440.
So the revenue per student was less than 1/5 of the per capita income for the five years 1930, 1940,1950,1960, and 1970. The correct answer is Choice E.
This explanation uses the following strategies.
Strategy 4: Translate from a Figure to an Arithmetic or Algebraic Representation
Strategy 9: Estimate
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