 It is currently 28 Sep 2020, 00:59 ### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

#### Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here. # In distribution of 850 different measurements, x centimeters  Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS: Retired Moderator Joined: 07 Jun 2014
Posts: 4803
GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
Followers: 171

Kudos [?]: 2926  , given: 394

In distribution of 850 different measurements, x centimeters [#permalink]
3
KUDOS
Expert's post 00:00

Question Stats: 65% (01:40) correct 34% (01:45) wrong based on 197 sessions
In a distribution of 850 different measurements, x centimeters is at the 73rd percentile. If there are 68 measurements in the distribution that are greater than y centimeters but less than x centimeters, then y is approximately at what percentile in the distribution?

A. 45th
B. 50th
C. 55th
D. 60th
E. 65th

Practice Questions
Question: 10
Page: 121
[Reveal] Spoiler: OA

_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test Retired Moderator Joined: 07 Jun 2014
Posts: 4803
GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
Followers: 171

Kudos [?]: 2926  , given: 394

Re: In distribution of 850 different measurements, x centimeters [#permalink]
5
KUDOS
Expert's post
Explanation

If x centimeters is at the 73rd percentile, then approximately 73% of the measurements in the distribution are less than or equal to x centimeters. The 68 measurements that are greater than y centimeters but less than x centimeters are $$\frac{68}{850}*100%$$, or 8%, of the distribution. Thus approximately 73% – 8%, or 65%, of the measurements are less than or equal to y centimeters, that is, y is approximately at the 65th percentile in the distribution. The correct answer is Choice E.
_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

Intern Joined: 24 May 2016
Posts: 33
Followers: 0

Kudos [?]: 12 , given: 22

Re: In distribution of 850 different measurements, x centimeters [#permalink]
sorry,i couldn't understand this question !!
if there is more simple clarification plz Retired Moderator Joined: 07 Jun 2014
Posts: 4803
GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
Followers: 171

Kudos [?]: 2926  , given: 394

Re: In distribution of 850 different measurements, x centimeters [#permalink]
1
KUDOS
Expert's post
awamy wrote:
sorry,i couldn't understand this question !!
if there is more simple clarification plz

There are 68 measurements between x and y. Now if x is at 73% what is % corresponding to y.

Since $$\frac{68}{850} \times 100 = 8%$$ so % corresponding to y is $$73% - 8% = 65%$$

Hence option E or 65% is correct.
_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test GRE Instructor Joined: 10 Apr 2015
Posts: 3838
Followers: 149

Kudos [?]: 4499  , given: 69

Re: In distribution of 850 different measurements, x centimeters [#permalink]
5
KUDOS
Expert's post
sandy wrote:
In a distribution of 850 different measurements, x centimeters is at the 73rd percentile. If there are 68 measurements in the distribution that are greater than y centimeters but less than x centimeters, then y is approximately at what percentile in the distribution?

A. 45th
B. 50th
C. 55th
D. 60th
E. 65th

In a distribution of 850 different measurements, x centimeters is at the 73rd percentile.
73% of 850 = 620.5, which is approximately 621
So, we know that approximately 621 measurements are less than x (and the other 229 measurements are greater than x).
We might sketch it as follows:
-------621 measurements----------x------229 measurements

There are 68 measurements in the distribution that are greater than y centimeters but less than x centimeters
We can add this to our sketch as follows:
-------553 measurements-------y----68 measurements----x------229 measurements

Notice that there are 621 measurements less than x, AND there are 68 measurements between y and x.
621 - 68 = 553 .
So, we can conclude that 553 measurements are less than y

y is approximately at what percentile in the distribution?
553 of the 850 measurements are less than y.
553/850 ≈ 65%

_________________

Brent Hanneson – Creator of greenlighttestprep.com
If you enjoy my solutions, you'll like my GRE prep course. Intern Joined: 25 May 2017
Posts: 1
Followers: 0

Kudos [?]: 0 , given: 0

Re: In distribution of 850 different measurements, x centimeters [#permalink]
why is it reasonable that the distribution is assumed to be uniform? i.e what are the clues that tell the distribution is uniform?
GRE Instructor Joined: 10 Apr 2015
Posts: 3838
Followers: 149

Kudos [?]: 4499 , given: 69

Re: In distribution of 850 different measurements, x centimeters [#permalink]
Expert's post
ayi wrote:
why is it reasonable that the distribution is assumed to be uniform? i.e what are the clues that tell the distribution is uniform?

We don't need a uniform distribution to answer this question. The percentiles are sufficient to arrive at the correct answer.

Cheers,
Brent
_________________

Brent Hanneson – Creator of greenlighttestprep.com
If you enjoy my solutions, you'll like my GRE prep course.  Target Test Prep Representative Affiliations: Target Test Prep
Joined: 09 May 2016
Posts: 161
Location: United States
Followers: 8

Kudos [?]: 195  , given: 0

Re: In distribution of 850 different measurements, x centimeters [#permalink]
2
KUDOS
Expert's post
sandy wrote:
In a distribution of 850 different measurements, x centimeters is at the 73rd percentile. If there are 68 measurements in the distribution that are greater than y centimeters but less than x centimeters, then y is approximately at what percentile in the distribution?

A. 45th
B. 50th
C. 55th
D. 60th
E. 65th

Since 68/850 = 0.08 = 8%, and there are 68 measurements that are less than x but greater than y, y is in the 73 - 8 = 65th percentile.

_________________

# Jeffrey Miller

Jeff@TargetTestPrep.com

See why Target Test Prep is the top rated GRE quant course on GRE Prep Club. Read Our Reviews

Manager Joined: 09 Mar 2019
Posts: 52
Followers: 0

Kudos [?]: 15 , given: 0

Re: In distribution of 850 different measurements, x centimeters [#permalink]
I got D intially, however don't take 68 place of 73 while deducting 8percentile.
Thanks..
Intern Joined: 28 May 2020
Posts: 10
Followers: 0

Kudos [?]: 0 , given: 1

Re: In distribution of 850 different measurements, x centimeters [#permalink]
Does anyone know if there are types of questions like this? I've only seen 2/3 but maybe I'm looking at the wrong questions. Thanks! GRE Instructor Joined: 10 Apr 2015
Posts: 3838
Followers: 149

Kudos [?]: 4499  , given: 69

Re: In distribution of 850 different measurements, x centimeters [#permalink]
1
KUDOS
Expert's post
chajaemin90 wrote:
Does anyone know if there are types of questions like this? I've only seen 2/3 but maybe I'm looking at the wrong questions. Thanks!

You'll find some similar questions in the Reinforcement Activities box (under the video lesson) here: https://www.greenlighttestprep.com/modu ... video/1362
_________________

Brent Hanneson – Creator of greenlighttestprep.com
If you enjoy my solutions, you'll like my GRE prep course. Intern Joined: 28 May 2020
Posts: 10
Followers: 0

Kudos [?]: 0 , given: 1

Re: In distribution of 850 different measurements, x centimeters [#permalink]
thanks! Re: In distribution of 850 different measurements, x centimeters   [#permalink] 25 Jul 2020, 10:57
Display posts from previous: Sort by

# In distribution of 850 different measurements, x centimeters  Question banks Downloads My Bookmarks Reviews Important topics  Powered by phpBB © phpBB Group Kindly note that the GRE® test is a registered trademark of the Educational Testing Service®, and this site has neither been reviewed nor endorsed by ETS®.