SAT数学Problem Solving练习题（5）

>>SAT考试：SAT数学Problem Solving练习题（5）

>>SAT考试辅导：精品课程高端指导

Question #9: What is the value of the median of an equilateral triangle with all sides equal to 5?

(a) (5/2) · √3

(b) 5 · √3

(c) (5/2) · 3-3

(d) 5/2

(e) 5

Answer: The median divides the equilateral triangle in two right triangles. Conform to the Pythagorean theorem, wherein the sum of the squares of the two legs is equal to the square of the hypotenuse,

m2 + (5/2)2= 52

m2 = 52 - (5/2)2 = 52 - 52/4 = (3/4) · 52

m = (5/2) · √3.

Question #10: A parameter is measured during a scientific experiment and the results are -12, 4, -8, 10, 2, 2, 0, -4 and 2. The median and the average of these numbers are:

(a) median = 0, average = -4/9

(b) median = 0, average = 4/9

(c) median = 2, average = -4/9

(d) median = 2, average = 4/9

(e) median = 2, average = 2/9

Answer: You must arrange the numbers in order: -12, -8, -4, 0, 2, 2, 2, 4, and 10.

The median will be number in the middle of the row, that is 2.

The average will be (-12-8-4+0+2+2+2+4+10)/9 = -4/9.

想要了解更多习题？请继续关注坦途网SAT考试频道，让我们一起为考试冲刺！