It is currently 09 Dec 2018, 13:15
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.

In a survey, 86 high school students were randomly selected

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
1 KUDOS received
Senior Manager
Senior Manager
Joined: 20 May 2014
Posts: 282
Followers: 15

Kudos [?]: 49 [1] , given: 220

CAT Tests
In a survey, 86 high school students were randomly selected [#permalink] New post 15 Oct 2017, 22:42
1
This post received
KUDOS
00:00

Question Stats:

100% (02:42) correct 0% (00:00) wrong based on 4 sessions
In a survey, 86 high school students were randomly selected and asked how many hours of television they had watched in the previous week. The histogram below displays their answers.

Image

Quantity A
Quantity B
The mean number of hours of TV watched last week
The median number of hours of TV watched last week


A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given


Kudos for correct solution.


[Reveal] Spoiler:
Attachment:
newest-histogram.jpg
newest-histogram.jpg [ 21.04 KiB | Viewed 1535 times ]
1 KUDOS received
Director
Director
Joined: 03 Sep 2017
Posts: 521
Followers: 1

Kudos [?]: 330 [1] , given: 66

Re: In a survey, 86 high school students were randomly selected [#permalink] New post 15 Oct 2017, 23:54
1
This post received
KUDOS
An easy trick to solve it is to notice that this distribution has a long right hand tail, meaning that there are individuals with high values of hours spent on TV (higher mean) but they are few (the median is low). Thus, the mean is higher than the median and answer is A
4 KUDOS received
Intern
Intern
Joined: 23 Nov 2017
Posts: 45
Followers: 0

Kudos [?]: 44 [4] , given: 0

Re: In a survey, 86 high school students were randomly selected [#permalink] New post 29 Nov 2017, 04:13
4
This post received
KUDOS
If I had gotten this one wrong, I probably would have given up my plans to become a statistician!!!!!!!

The median is basically the number in a set that is right in the middle of the set. In order to find the median, you first need to WRITE THE NUMBERS IN A SET IN ASCENDING ORDER.

3 - 5 - 6 - 7 - 13 - 17 - 35

Now we need to look at the set and decide which number is in the middle. 7 is the best choice because there are exacltly 3 numbers to its right (13, 17 and 35) and 3 numbers to its left (3.5 and 6).

Qunatity B is thus 7.

The mean is the avarage of all numbers in a set. All we need to do is add all numbers together and divide the result by how many numbeers there are in the set.

3 + 5 + 6 + 7 + 13 + 17 + 35 = 86

There are 7 numbers in this set.

86/7 = 12.3

Quantity A is 12.3

Qunaity A is greater than quantity B. A is the answer.

This histogram can be a bit tricky to read so I may have gotten some of the numbers wrong.
Display posts from previous: Sort by

In a survey, 86 high school students were randomly selected

  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®.