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n questions can either be true or false. If you answer all n correct you win. What is the least value of n for which the probability is less than 1/1000 for you to win by guessing randomly? a. 5 b. 10 c. 50 d. 100 e. 1000 Hi again Akansha! Before we start, I want to point out a problem with this pa...
- by Akansha
Tue May 31, 2011 8:58 pm- Forum: Problem Solving
- Topic: Probability
- Replies: 4
- Views: 1494
Members who speak 2 of 3 languages
Of 200 members, each member who speaks German also speaks English,
and 70 of members only speak Spanish. If no member speaks all 3 languages, how
many of the members speak 2 of the 3 languages?
a. 60 members speak only English
b. 20 members do not speak any of the 3 languages
OA is C
- by Akansha
Tue May 31, 2011 6:40 pm- Forum: Data Sufficiency
- Topic: Members who speak 2 of 3 languages
- Replies: 2
- Views: 620
- by Akansha
Tue May 31, 2011 6:33 pm- Forum: Data Sufficiency
- Topic: Inequalities
- Replies: 4
- Views: 1179
Maximum possible Length
5 pieces of wood have an average length of 124cm and median length of
140cm. what is the maximum possible length of the shortest piece of wood?
a. 90
b. 100
c. 110
d. 130
e. 140
OA is B
- by Akansha
Tue May 31, 2011 6:17 pm- Forum: Problem Solving
- Topic: Maximum possible Length
- Replies: 2
- Views: 1060
Probability
n questions can either be true or false. If you answer all n correct you win.
What is the least value of n for which the probability is less than 1/1000 for you to
win by guessing randomly?
a. 5
b. 10
c. 50
d. 100
e. 1000
OA is B
- by Akansha
Tue May 31, 2011 6:15 pm- Forum: Problem Solving
- Topic: Probability
- Replies: 5
- Views: 1211
Speed&Time
How long did it take to travel 400km?
a. The car travelled the first 200km in 2.5hrs
b. If the car’s average speed had been 20 km/h faster, it would have travelled
the 400km in 1 hour less time.
OA is B
- by Akansha
Tue May 31, 2011 6:11 pm- Forum: Data Sufficiency
- Topic: Speed&Time
- Replies: 2
- Views: 1153
Average Length
5 pieces of wood have an average length of 124cm and median length of
140cm. what is the maximum possible length of the shortest piece of wood?
a. 90
b. 100
c. 110
d. 130
e. 140
OA is B
- by Akansha
Sun May 29, 2011 10:42 am- Forum: Problem Solving
- Topic: Average Length
- Replies: 3
- Views: 1512
Probability
n questions can either be true or false. If you answer all n correct you win.
What is the least value of n for which the probability is less than 1/1000 for you to
win by guessing randomly?
a. 5
b. 10
c. 50
d. 100
e. 1000
OA is B
- by Akansha
Sun May 29, 2011 10:41 am- Forum: Problem Solving
- Topic: Probability
- Replies: 4
- Views: 1494
Speed&Distance
How long did it take to travel 400km?
a. The car travelled the first 200km in 2.5hrs
b. If the car’s average speed had been 20 km/h faster, it would have travelled
the 400km in 1 hour less time.
OA is B
- by Akansha
Sun May 29, 2011 10:40 am- Forum: Data Sufficiency
- Topic: Speed&Distance
- Replies: 3
- Views: 1061
Sum of Integers
Sum of 1st 50 positive integers is 2550. What is sum of even integers from
102 to 200 inclusive?
a. 5100
b. 7550
c. 10100
d. 15500
e. 20100
OA is B
- by Akansha
Sun May 29, 2011 10:38 am- Forum: Problem Solving
- Topic: Sum of Integers
- Replies: 2
- Views: 1130
Equations
If each pencil is either 23 cents or 21 cents, how many 23 cent pencils did
Martha buy?
a. Martha bought a total of 6 pencils
b. Total value of pencils Martha bought was 130 cents
OA is B
- by Akansha
Sun May 29, 2011 10:37 am- Forum: Data Sufficiency
- Topic: Equations
- Replies: 3
- Views: 1080
Root Expressions
x < 0, then √-x |x| (root of the whole expression)
a. -x
b. -1
c. 1
d. X
e. √x
OA is A. I got the answer as D. Can someone tell why is it not so? [/spoiler]
- by Akansha
Sun May 29, 2011 10:36 am- Forum: Problem Solving
- Topic: Root Expressions
- Replies: 2
- Views: 929
Quadrants
If ab ≠0 and (-a, b) and (-b, a) are in the same quadrant, is (-x, y) in this
quadrant?
a. xy > 0
b. ax > 0
OA is C
- by Akansha
Sun May 29, 2011 10:33 am- Forum: Data Sufficiency
- Topic: Quadrants
- Replies: 3
- Views: 1055
Percentile
Angela’s grade was in the 90th percentile out of 80 grades in her class. In
another class there were 19 grades higher than Angela’s. If nobody had Angela’s
grade, then Angela was what percentile of the two classes combined?
a. 72
b. 80
c. 81
d. 85
e. 92
OA is D
- by Akansha
Sun May 29, 2011 10:32 am- Forum: Problem Solving
- Topic: Percentile
- Replies: 2
- Views: 1160
Distance
Distance between x and y is greater than distance between x and z. Does z
lie between x and y on the number line?
a. xyz < 0
b. xy < 0
OA is A
- by Akansha
Sun May 29, 2011 10:31 am- Forum: Data Sufficiency
- Topic: Distance
- Replies: 1
- Views: 999