GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video
close
It is currently 14 May 2021, 05:22
Register
GMAT Club Tests
Decision Tracker
My Rewards
New posts
New comers' posts

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.

Go to My Error Log Learn more
Close

Request Expert Reply

Confirm Cancel
A research report states that the average (arithmetic mean) of 120 mea
4 posts Go to First Unread Post
Print view
NEW TOPIC
POST REPLY
Downloads
My Bookmarks
Reviews
SORT BY:
Date
Kudos
Tags:
Find Similar Topics 

Show Tags
Hide Tags

User avatar
V
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 74917
CAT Tests Top Member of the Month
A research report states that the average (arithmetic mean) of 120 mea [#permalink] New post  10 Dec 2019, 01:09
Expert Reply
Attempt only this question Same topic and source Same topic and difficulty Same source and difficulty Random Chronological Reverse chronological Learn more
00:00
A
B
C
D
E

Difficulty:

15% (low)

Question Stats:

87% (01:07) correct 13% (01:22) wrong based on 61 sessions

Hide Show timer Statistics

A research report states that the average (arithmetic mean) of 120 measurements was 72.5, the greatest of the 120 measurements was 92.8, and the range of the 120 measurements was 51.6.

The information given above is sufficient to determine the value of which of the following statistics?

I. The least of the 120 measurements
II. The median of the 120 measurements
III. The sum of the 120 measurements

A. I only
B. II only
C. III only
D. I and III only
E. I, II, and III


Are You Up For the Challenge: 700 Level Questions
ShowHide Answer
Official Answer
Official Answer and Stats are available only to registered users. Register/Login.

_________________
New to the GMAT CLUB Forum?
Posting Rules: QUANTITATIVE | VERBAL. Guides and Resources: QUANTITATIVE | VERBAL | Ultimate GMAT Quantitative Megathread | All You Need for Quant

Questions' Banks and Collection:
PS: Standard deviation | Tough Problem Solving Questions With Solutions | Probability and Combinations Questions With Solutions | Tough and tricky exponents and roots questions | 12 Easy Pieces (or not?) | Bakers' Dozen | Algebra set | Mixed Questions | Fresh Meat
DS: DS Standard deviation | Inequalities | 700+ GMAT Data Sufficiency Questions With Explanations | Tough and tricky exponents and roots questions | The Discreet Charm of the DS | Devil's Dozen!!! | Number Properties set | New DS set
MIXED: GMAT Club's Complete Questions' Bank | SEVEN SAMURAI OF 2012 | Tricky questions from previous years. | Special Questions' Directory | Best Of The Best Of 2017 | The Best Of Quant of 2016 | 20 hardest and 20 best questions of 2015 | 15 best topics of 2015 | Seven Samurai of 2012 | GMAT Probability Questions

What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics
Signature Read More
Attempt only this question Same topic and source Same topic and difficulty Same source and difficulty Random Chronological Reverse chronological Learn more
avatar
D
lacktutor
Director
Director
Joined: 25 Jul 2018
Posts: 730
A research report states that the average (arithmetic mean) of 120 mea [#permalink] New post  10 Dec 2019, 03:21
Arithmetic mean=\(\frac{( a_1+a_2+...+a_n)}{120} = 72.5\)

—> \(a_n = 92.8\)
The range = \(a_n —a_1 = 51.6 \)

I. The least of the 120 measurements
—> \(a_1 = a_n —51.6 = 31.2\) (Yes)

II. The median of the 120 measurements— we don’t know whether the measurements are consecutive numbers. (No)

III. The sum of the 120 measurements
—> \(a_1+a_2+...+a_n= 120*72.5\) (yes)

We could find only I and III.
The answer is D

Posted from my mobile device
avatar
D
exc4libur
SVP
SVP
Joined: 24 Nov 2016
Posts: 1890
Location: United States
Re: A research report states that the average (arithmetic mean) of 120 mea [#permalink] New post  11 Dec 2019, 07:05
Bunuel wrote:
A research report states that the average (arithmetic mean) of 120 measurements was 72.5, the greatest of the 120 measurements was 92.8, and the range of the 120 measurements was 51.6.

The information given above is sufficient to determine the value of which of the following statistics?

I. The least of the 120 measurements
II. The median of the 120 measurements
III. The sum of the 120 measurements

A. I only
B. II only
C. III only
D. I and III only
E. I, II, and III


Are You Up For the Challenge: 700 Level Questions


n=120
avg=72.5
sum=n*avg
tn=92.8
rng=tn-a=51.6
a=92.8-51.6

Ans (D)
User avatar
V
ScottTargetTestPrep
Target Test Prep Representative
Joined: 14 Oct 2015
Status:Founder & CEO
Affiliations: Target Test Prep
Posts: 14038
Location: United States (CA)
Re: A research report states that the average (arithmetic mean) of 120 mea [#permalink] New post  12 Dec 2019, 18:50
Expert Reply
Bunuel wrote:
A research report states that the average (arithmetic mean) of 120 measurements was 72.5, the greatest of the 120 measurements was 92.8, and the range of the 120 measurements was 51.6.

The information given above is sufficient to determine the value of which of the following statistics?

I. The least of the 120 measurements
II. The median of the 120 measurements
III. The sum of the 120 measurements

A. I only
B. II only
C. III only
D. I and III only
E. I, II, and III


Are You Up For the Challenge: 700 Level Questions


Since we know the average and the quantity, we can determine the sum. Since we know the largest measurement and the range, we can determine the smallest measurement. However, it is not possible to determine the median of the 120 measurements from the information given to us.

Answer: D
_________________

★ ★ ★ ★ ★   350 REVIEWS

5-STAR RATED ONLINE GMAT QUANT SELF STUDY COURSE

NOW WITH GMAT VERBAL (Pre-Launch)

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

Signature Read More
GMAT Club Bot
gmatclubot
Re: A research report states that the average (arithmetic mean) of 120 mea [#permalink]
12 Dec 2019, 18:50
NEW TOPIC
POST REPLY
Downloads
My Bookmarks
Reviews
Moderators:
chetan2u
Math Expert
9831 posts
Bunuel
Math Expert
74917 posts
yashikaaggarwal
Senior Moderator - Masters Forum
2469 posts
generis
Senior SC Moderator
4739 posts

cron

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions