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# IR question from Princeton Review 2013.. help needed

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Intern
Joined: 05 Dec 2011
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IR question from Princeton Review 2013.. help needed [#permalink]  09 Jun 2012, 20:50
Here is another IR question from PR 2013.

Solved most of the questions except some from the 'True-False' questions.
Can someone please help.
Thanks in advance
Senior Manager
Joined: 13 Jan 2012
Posts: 307
Weight: 170lbs
GMAT 1: 730 Q48 V42
GMAT 2: 740 Q48 V42
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Re: IR question from Princeton Review 2013.. help needed [#permalink]  09 Jun 2012, 22:03
2
This post received
KUDOS
Here are my notes. How did I do? Helpful?

Section 1:

A:
No. Only implies that it's happened before, possibly last year.

B:
Yes. Midwest Mean = West Mean = min(all means).

C:
No. Could be Level 2 + anybody else, probably also ROMs.

D:
Yes. He/she can delegate.

Section 2:

A:
We know that BB is 50% of difference between ticket price and that region's mean. For West, mean is 200. Only tickets purchases below 1 SD (25) are the 18 purchased at 150. A few different ways to do the math here, I'll do this:
200 - 150 = 50
50 * 50% = 25
25 * 18 = (25*20) - (25*2) = 500 - 50 = 450
:. West will receive BB of $450. :. True B: Mid-Atlantic info from chart: 500 sample size, 350 mean, and SD of 50. I'm not convinced about this one because I'm not sure whether this is a normal distribution. In a SD, 68% of the tickets would be within one standard deviation and 95% of the tickets would be within two. Let's run with that. So$450 is two standard deviations away, so is 5% / 2 of the sample size greater than 20? It's important that we also divide 5% by 2 because that's just the portion that is on the upper end of the normal distribution.
500 * 0.1 = 50 * 0.1 = 5
:. 5 = 1% of 500
:. 5% of 500 = 25
:. 2.5% = 12.5
:. 12.5 < 20
:. False

C:
Same process as in B. 400 sample size, 300 mean, and 50 SD. This time we're only talking about one SD though. Is 32% / 2 of the sample size greater than 50? Let's estimate because it's timed.
400 * .1 = 40 * 3 = 120 = 30% of 400
:. 15% of 400 = 60
:. 60>50
:. True

D:
Midwest: 300 sample, 200 mean, 25 SD
:. Mean - 2*SD = 200-50 = 150
Plains: 400 sample, 300 mean, 75 SD
:. Mean - 2*SD = 300-150 = 150
:. False
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Re: IR question from Princeton Review 2013.. help needed [#permalink]  14 Jun 2012, 12:50
thanks a lot !! It helps me a lot !!
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Re: IR question from Princeton Review 2013.. help needed [#permalink]  14 Jun 2012, 19:27
It is worth noting that statistics have been defined as "normally distributed"
That's why ,
68% will fall under 1 Deviation (32% lie outside)
95% will fall under 2 Deviation
99.5% will fall under 3 Deviation
99.999997% will fall under 6 deviation
Had it not been the "normal distribution", answer of C (II question) might have been different.
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Director
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Re: IR question from Princeton Review 2013.. help needed [#permalink]  18 Jul 2012, 00:07
do the 3 questions of this kind-multi source reasoning-appear at the end of the IR section?

I see this kind of question hard and want to ignore this kind. Can I do that but still get "no problem " score on IR?
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Re: IR question from Princeton Review 2013.. help needed [#permalink]  31 Jul 2014, 15:32
Please, someone has the part of IR in the princeton books? I need the solution from the item 5 to 12 in the practice section 2. Please!!!!
Re: IR question from Princeton Review 2013.. help needed   [#permalink] 31 Jul 2014, 15:32
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# IR question from Princeton Review 2013.. help needed

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