SAT数学：今日份的3道练习题(附答案和详解)

SAT数学练习题1：

Which of the following equations represents a line inthe xy-plane with x-intercept at (-15,0) and y-intercept at (0,-9)?

A. x/15+y/9=1

B. -x/15-y/9=1

C. x/9-y/15=1

D. -x/9+y/15=1

答案：B

SAT数学练习题2：

For each of the largest 21 airline companies in Europe, the average flight delay was calculatedand is shown in the dot plot above. If the dots representing the two airlines with the longestaverage flight delays are removed from the dot plot, what will happen to the mean, median, and range of the new data set?

A.Only the mean will decrease.

B.Only the mean and range will decrease.

C.Only the mean and median will decrease.

D.The mean, median, and range will decrease.

答案：B

SAT数学练习题3：

In the US House of Representatives, about 12.2% ofthe representatives are from the state of California. If there are 435 representatives, how many are not from California?

A.12.2

B.53

C.382

D.488

答案：C

解析：

Choice C is correct. Use the variable r to representthe number of representatives from California, set upan equation to determine how manyrepresentatives are from California.

(0.122)(435)=r, and so r=53.07

There are 53 representatives from California.

To find the number of representatives not from California, subtract the number ofrepresentatives from California from the total number of representatives.

435-53=382

Therefore, 382 of the representatives are not from California.

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