Search found 6 matches
Sorry, never mind. I just worked out how to get the same answer using your method and i think it's a lot easier. Thanks!!!!
- by katty
Wed Oct 22, 2008 3:20 pm- Forum: Problem Solving
- Topic: Probability with Combinations
- Replies: 6
- Views: 3328
Yes that is the correct answer. But I'm just trying to wrap my head around how I could use combinations for this kind of question. I had another similar question before which was: The probability that it will rain in town A is 50%. What is the probability that it will rain exactly 3 days out of a 5-...
- by katty
Wed Oct 22, 2008 3:12 pm- Forum: Problem Solving
- Topic: Probability with Combinations
- Replies: 6
- Views: 3328
Probability with Combinations
Hi, In one of the Princeton Review online tests: There is a 90% chance that a registered voter in Burghtown voted in the last election. If five registered voters are chosen at random, what is the approximate likelihood that exactly four of them voted in the last election? Okay, so I know that first,...
- by katty
Wed Oct 22, 2008 2:38 pm- Forum: Problem Solving
- Topic: Probability with Combinations
- Replies: 6
- Views: 3328
It had the same logic for 2 other questions on the practice test I did.
So do you think I should ignore this and just go with the previous logic - that if a statement gives an answer that is always yes or always no, then the statement is sufficient?
- by katty
Tue Oct 21, 2008 7:54 am- Forum: Data Sufficiency
- Topic: DS - always yes, or always no
- Replies: 6
- Views: 1855
DS - always yes, or always no
So the Princeton Review says that if the answer to a data sufficiency can be found to be EITHER always YES or always NO, then the data is sufficient. This makes sense. HOWEVER, I am doing the Mcgraw-Hill Conquering Math book (2006 ed.) and for some of the questions, even when the answer is ALWAYS NO...
- by katty
Mon Oct 20, 2008 3:01 pm- Forum: Data Sufficiency
- Topic: DS - always yes, or always no
- Replies: 6
- Views: 1855
doing this question again!
Princeton Review Question 3 in Hard Math Bin - this forum was discussing it previously and I am now doing the question and find it confusing. I get that the top 2% should be the 3rd standard deviation, but then the answer in the book says the scores below 67 and 62 (2 and 3 standard deviations from ...
- by katty
Sun Oct 19, 2008 9:39 am- Forum: Data Sufficiency
- Topic: Standard deviation and mean
- Replies: 17
- Views: 8005