<div style="margin: 0in 0in 0pt">7-Q2
If 2 different representatives are to be selected at random from a group of 10 employees and if p is the probabitily that both representatives selected will be women, is p>1/2?
(1)More than of the 10 employees are women.
(2)The probability that both representatives selected will be men is less than.
<div style="margin: 0in 0in 0pt">7-Q3
Material A costs $3 per kilogram, and material B costs $5 per kilogram. If 10 kilograms of material K cosists of x kilograms of material A and y kilograms of material B, is x>y?
(2)The cost of the 10 kilograms of material K is less than $40
<div style="margin: 0in 0in 0pt">7-Q4
For a recent play performance, the ticket prices were $25 per adult and $15 per child. A total of 500 tickets were sold for the performance. How many of the tickets sold were for adults?
(1)Revenue from ticket sales for this performance totaled $10500
(2)The average(arithmetic mean) price per ticket sold was $21
<div style="margin: 0in 0in 0pt">7-Q8
The infinite sequence a1,a2,a3,...,an,...is such that a1=2, a2=-3, a3=5, a4=-1, and an=a(n-4) for n>4. What is the sum of the first 97 terms of the sequence?
A.72 B. 74 C.75 D.78 E.80
<div style="margin: 0in 0in 0pt">7-Q14
If a code word is defined to be a sequence of different letters chosen from the 10 letters A,B,C,D,E,F,G,H,I,and J, what is the ratio of the number os 5-letter code words to the number of 4-letter code words?
A.5 to 4 B. 3 to 2 C. 2 to 1 D. 5 to 1 E.6 to 1
<div style="margin: 0in 0in 0pt">7-Q22
The number of defects in the first five cars to come through a new production line are
9,7,10,4 and 6, respectively. If the sixth car through the production line has either 3, 7 or 12 defects, for wihch of theses valurs does the mean number of defects per car for the first six cars equal the median?
I.3 II.7 III.12 </div><div style="margin: 0in 0in 0pt">A. I only B. II only C.IIIonly D. I and III only E. I,II and III</div><div style="margin: 0in 0in 0pt"> </div></div></div></div></div></div>
提问时间：2010-01-17 16:40:12提问者： Kathy00097 [初中生]
1:10个里面选2个代表,(2 different representatives )=不是一个人,选出同时是2个女人的情况>1/2
回答时间：2010-01-19 11:53:32 回答者：zsk_koo [知识堂达人]