1、 In a data set of 10,000 numbers varying from 20 to 80,the number 62 is the 60th percentile and the number 74 is the nth percentile.
QuantityA Quantity B
n 70
A. Quantity A is greater.
B. Quantity B is greater.
C. The two quantities are equal.
D. The relationship cannot be determined from theinformation given.
解析
答案:D
注意这个题没有说这10000个数字是均匀分布的,所以nth 和70的大小是无法比较的。
2、Which of the following statements individually provide(s) sufficient additional information to determine the area of triangle ABC above? Indicate all such statements.
A DBC is an equilateral triangle.
B ABD is an isosceles triangle.
C The length of BC is equal to the length of AD.
D The length of BC is 10.
E The length of AD is 10
解析
只告诉了三角形是直角三角形和一条直角边,要求我们补充条件可以求得三角形的面积。只能用排除法。A说三角形DBC是等边的,角C就是60度了,其他的便也就可以求出来了,面积就可以求。B说ABD是等腰三角形,这个没意义,因为没说那两个边是等的,比如如果AB=AD,是没法求的,C说BC=AD,这个条件是没有意义的,因为我们的D点可以移动,当三角形的大小发生变化时,我们总可以找到对应的D点使得AD=BC,D选项说BC=10,这就可以求了,E说AD的长是10,这个同样没意义。所以选AD。
26.What is the least positive integer that is not a factor of 25! and is not a prime number?
A 26
B 28
C 36
D 56
E 58
解析
这个题,你看25!里面包括了2到25的所有factor了,所以你看26=2*13,28=2*14,36=2*18,56=7*8,而只有58=2*29,29不在里面,所以就选这个了