每日一题：SAT数学高频考点例题分析（一）

　　SAT数学考试难度要小于国内高中课程，所以一般国内的高中生在理论上都是可以拿到不错的SAT Subject数学成绩的。

　　SAT数学考试分为是level1和level2两个部分，SAT Subject数学level1的数学包含一些矩阵，代数，概率，平面几何，3D几何等等；和level2包含的内容几乎没有差别。

　　他们的区别在于各个知识点的权重。比如说level2会有更多的3D几何题目而几乎没有平面几何题目。难度当然是level2高一些，因此，SAT Subject level2的容错率也会高出一些(一般是7~8题左右，每次都会有变动)。

　　例题分析

　　An employer wants to compare the commute times of 1st- and 2nd-shift employees. The two histograms show the average commute times for each group. The first bar includes average commute times greater than or equal to zero and less than 6. The second bar includes average commute times greater than or equal to 6 and less than 12, and so on. Both shifts have a mean commute of 17 minutes. Which of the following statements best compares the standard deviations of the average commute times of the shifts?

　　A.The standard deviations are equal.

　　B.The standard deviation for the 1st-shift employees is greater.

　　C.The standard deviation for the 2nd-shift employees is greater.

　　D.These histograms do not provide enough information to compare the two standarddeviations.

　　答案：C

　　解析：

　　Option C is correct. The data for the 2nd shift aremore spread out from the mean than the data forthe 1st shift.

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