It is currently 20 Jul 2019, 14:19
My Tests

Close

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
Your Progress

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.

Eight hundred insects were weighed, and the resulting measur

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Founder
Founder
User avatar
Joined: 18 Apr 2015
Posts: 7395
Followers: 124

Kudos [?]: 1449 [0], given: 6602

CAT Tests
Eight hundred insects were weighed, and the resulting measur [#permalink] New post 30 May 2019, 10:33
Expert's post
Eight hundred insects were weighed, and the resulting measurements, in milligrams, are summarized in the boxplot below.

Attachment:
#GREexcercise Eight hundred insects were weighed.jpg
#GREexcercise Eight hundred insects were weighed.jpg [ 23.86 KiB | Viewed 483 times ]


(a) What are the range, the three quartiles, and the interquartile range of the measurements?
(b) If the 80th percentile of the measurements is 130 milligrams, about how many measurements are between 126 milligrams and 130 milligrams?

[Reveal] Spoiler: OA
(a) range=41, Q_1 =114, Q_2 =118, Q_3 =126, interquartilerange=12 (b) 40 measurements


Math Review
Question: 5
Page: 297
Difficulty: medium

_________________

Get the 2 FREE GREPrepclub Tests

Intern
Intern
Joined: 02 Mar 2019
Posts: 45
Followers: 0

Kudos [?]: 4 [0], given: 48

CAT Tests
Re: Eight hundred insects were weighed, and the resulting measur [#permalink] New post 13 Jun 2019, 08:59
Hi,

Any explanations for the 2nd question?

Thanks!
1 KUDOS received
GRE Instructor
User avatar
Joined: 10 Apr 2015
Posts: 2170
Followers: 64

Kudos [?]: 1982 [1] , given: 20

CAT Tests
Re: Eight hundred insects were weighed, and the resulting measur [#permalink] New post 14 Jun 2019, 11:46
1
This post received
KUDOS
Expert's post
Carcass wrote:
Eight hundred insects were weighed, and the resulting measurements, in milligrams, are summarized in the boxplot below.

Attachment:
The attachment #GREexcercise Eight hundred insects were weighed.jpg is no longer available


(a) What are the range, the three quartiles, and the interquartile range of the measurements?
(b) If the 80th percentile of the measurements is 130 milligrams, about how many measurements are between 126 milligrams and 130 milligrams?

[Reveal] Spoiler: OA
(a) range=41, Q_1 =114, Q_2 =118, Q_3 =126, interquartilerange=12 (b) 40 measurements


Math Review
Question: 5
Page: 297
Difficulty: medium


(a) What are the range, the three quartiles, and the interquartile range of the measurements?

Attachment:
Eight hundred insects were weighed, and the resulting measurements1.png
Eight hundred insects were weighed, and the resulting measurements1.png [ 12.69 KiB | Viewed 331 times ]


Range = 146 - 105 = 41


Attachment:
Eight hundred insects were weighed, and the resulting measurements2.png
Eight hundred insects were weighed, and the resulting measurements2.png [ 12.95 KiB | Viewed 330 times ]

The three quartiles are:
Q1 = 114, Q2 = 118, Q3 = 126

The interquartile range = (3rd quartile) - (1st quartile)
= 126 - 114
= 12

----------------------------------

(b) If the 80th percentile of the measurements is 130 milligrams, about how many measurements are between 126 milligrams and 130 milligrams?

80th percentile of the measurements is 130 milligrams
This means 80% of the measurements are LESS than 130 mg
80% of 800 = 640
So, 640 measurements are LESS than 130 mg

KEY CONCEPT: The 3rd quartile (Q3) is the same as the 75th percentile.
Q3 = 126
So, 75% of the measurements are LESS than 126 mg
75% of 800 = 600
So, 60 measurements are LESS than 126 mg

We get:
Attachment:
Eight hundred insects were weighed, and the resulting measurements3.png
Eight hundred insects were weighed, and the resulting measurements3.png [ 24.75 KiB | Viewed 329 times ]


So, the number of measurements are BETWEEN 126 mg and 130 mg = 640 - 600 = 40

Cheers,
Brent
_________________

Brent Hanneson – Creator of greenlighttestprep.com
Image
Sign up for my free GRE Question of the Day emails

Display posts from previous: Sort by

Eight hundred insects were weighed, and the resulting measur

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

GRE Prep Club Forum Home| About| Terms and Conditions and Privacy Policy| GRE Prep Club Rules| Contact

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®.