[計量] 好多題計量問題
圖表題(真糟糕我的圖表題一直是我的痛)
Family X's expenditures as a percent of its gross annual income
1983 1984
Mortgage,Property Taxes, Insurance 24% 27%
Food 7% 11%
Utilities 4% 5%
Automobile Expenses 5% 5%
Savings 25% 12%
Miscellaneous 3% 10%
Income Taxes 32% 30%
In 1983, 100% = $50,000
In 1984, 100% = $45,000
1. Family X's gross income is the sum of Mr. X's income and Mrs. X's income.
In 1983 Mr. and Mrs. X each had an income of $25,000. If Mr. X's income
increased by 10 percent from 1983 to 1984, by what percent did Mrs. X's
income decrease for the same period?
(A) 10%
(B) 15%
(C) 20%
(D) 25%
(E) 30%
Ans: E
2. By approximately what percent did the amount that Family X put into
savings decrease from 1983 to 1984?
(A) 13%
(B) 23%
(C) 35%
(D) 45%
(E) 57%
Ans: E
If $4,500 was invested in a bond fund when the proce per share was
$9 and #3,000 was invested in the fund when the price per share was
$10, what was the average (arithmetic mean) price per share purchased?
(A) $9.625
(B) $9.50
(C) $9.40
(D) $9.375
(E) $9.20
Ans: D (不懂題目的意思)
n > 0
Column A Column B
n(n+1)+n+1/(n+1)^2 1
Ans: C
A rectangular rug covers half of a rectangular floor that is 9 feet wide
and 12 feet long. If the dimensions of the rug are in the same ration
as those of the floor, how many feet long is the rug?
(A) 6
(B) 21/2
(C) 2√7
(D) 6√2
(E) 4√6
Ans: D
IF X and Y are integers and X>Y>0, how many integers are there between
but not including, X and Y?
(A) X-Y
(B) X+Y
(C) X-Y-1
(D) X+Y-1
(E) X-Y+1
Ans: C
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