Was 70 the average (arithmetic mean) grade on a class test? : GMAT Data Sufficiency (DS)
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# Was 70 the average (arithmetic mean) grade on a class test?

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Was 70 the average (arithmetic mean) grade on a class test? [#permalink]

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08 Oct 2005, 07:58
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Was 70 the average (arithmetic mean) grade on a class test?

(1) On the test, half of the class had grades below 70 and half of the class had grades above 70.
(2) The lowest grade on the test was 45 and the highest grade on the test was 95.
[Reveal] Spoiler: OA

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08 Oct 2005, 08:54
Hmm E I think...i was struggling between C and E...

(a) is insuff..say half the students score 0 and the other half score 100...

you do not know the distribuition....

(b) it just gives us the range, If we knew the std. Deviation we could get the Avg...

together Insuff..(say in B if all students score 45, and all the other half scored 95....)
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08 Oct 2005, 09:31
i think E

We need the number of students in the class and more info. on the grades to find the mean.
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08 Oct 2005, 10:34
Click E --> Click Next --> Click Confirm

There is no way, to find out the average of the information given.

1 & 2 together... could be 50 times grade 45 and then 49 times grade 71 and one time grade 95...... or there could be another distribution, which has an effect on the average.
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08 Oct 2005, 19:25
nero44 wrote:
Click E --> Click Next --> Click Confirm

There is no way, to find out the average of the information given.

1 & 2 together... could be 50 times grade 45 and then 49 times grade 71 and one time grade 95...... or there could be another distribution, which has an effect on the average.

Agree! I posted this coz I was calculating the average using B by assuming (for some strange reason) that all the scores inbetween would be evenly placed!

OA is E!
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Cheers, Rahul.

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Re: Was 70 the average (arithmetic mean) grade on a class test? [#permalink]

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26 Sep 2013, 04:40
Is answer choice A.. a trap answer in this question?
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Re: Was 70 the average (arithmetic mean) grade on a class test? [#permalink]

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26 Sep 2013, 07:54
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fozzzy wrote:
Is answer choice A.. a trap answer in this question?

I find nothing too tricky in the first statement.

Was 70 the average (arithmetic mean) grade on a class test?

(1) On the test, half of the class had grades below 70 and half of the class had grades above 70 --> {69, 71} answer YES but {69, 100} answer NO. Not sufficient.

(2) The lowest grade on the test was 45 and the highest grade on the test was 95 --> {45, 95} answer YES but {45, 69, 95} answer NO. Not sufficient.

(1)+(2) {45, 95} answer YES but {45, 69, 95, 95} answer NO. Not sufficient.

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Re: Was 70 the average (arithmetic mean) grade on a class test? [#permalink]

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09 Dec 2014, 06:22
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Was 70 the average (arithmetic mean) grade on a class test?   [#permalink] 09 Dec 2014, 06:22
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# Was 70 the average (arithmetic mean) grade on a class test?

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Given a text passage, determine:
    1. If it contains a mathematical question (including word problems or calculations)
    2. If an answer to that mathematical question is provided in the text

First, describe the content structure you found in 1-2 sentences.

Then provide your analysis in the following format:
TYPE: <one of the following values>
- NO_QUESTION
- SINGLE_QUESTION
- SINGLE_QUESTION_WITH_ANSWER
- MULTIPLE_QUESTIONS
- MULTIPLE_QUESTIONS_WITH_ANSWERS
system
Was 70 the average (arithmetic mean) grade on a class test? : GMAT Data Sufficiency (DS)
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 It is currently 23 Feb 2017, 12:16

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# Was 70 the average (arithmetic mean) grade on a class test?

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Director
Joined: 15 Aug 2005
Posts: 798
Location: Singapore
Followers: 2

Kudos [?]: 56 [1] , given: 0

Was 70 the average (arithmetic mean) grade on a class test? [#permalink]

### Show Tags

08 Oct 2005, 07:58
1
KUDOS
1
This post was
BOOKMARKED
00:00

Difficulty:

15% (low)

Question Stats:

71% (01:34) correct 29% (00:33) wrong based on 148 sessions

### HideShow timer Statistics

Was 70 the average (arithmetic mean) grade on a class test?

(1) On the test, half of the class had grades below 70 and half of the class had grades above 70.
(2) The lowest grade on the test was 45 and the highest grade on the test was 95.
[Reveal] Spoiler: OA

_________________

Cheers, Rahul.

Current Student
Joined: 28 Dec 2004
Posts: 3384
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 15

Kudos [?]: 286 [0], given: 2

### Show Tags

08 Oct 2005, 08:54
Hmm E I think...i was struggling between C and E...

(a) is insuff..say half the students score 0 and the other half score 100...

you do not know the distribuition....

(b) it just gives us the range, If we knew the std. Deviation we could get the Avg...

together Insuff..(say in B if all students score 45, and all the other half scored 95....)
Director
Joined: 21 Aug 2005
Posts: 793
Followers: 2

Kudos [?]: 25 [0], given: 0

### Show Tags

08 Oct 2005, 09:31
i think E

We need the number of students in the class and more info. on the grades to find the mean.
Manager
Joined: 04 Oct 2005
Posts: 246
Followers: 1

Kudos [?]: 76 [0], given: 0

### Show Tags

08 Oct 2005, 10:34
Click E --> Click Next --> Click Confirm

There is no way, to find out the average of the information given.

1 & 2 together... could be 50 times grade 45 and then 49 times grade 71 and one time grade 95...... or there could be another distribution, which has an effect on the average.
Director
Joined: 15 Aug 2005
Posts: 798
Location: Singapore
Followers: 2

Kudos [?]: 56 [0], given: 0

### Show Tags

08 Oct 2005, 19:25
nero44 wrote:
Click E --> Click Next --> Click Confirm

There is no way, to find out the average of the information given.

1 & 2 together... could be 50 times grade 45 and then 49 times grade 71 and one time grade 95...... or there could be another distribution, which has an effect on the average.

Agree! I posted this coz I was calculating the average using B by assuming (for some strange reason) that all the scores inbetween would be evenly placed!

OA is E!
_________________

Cheers, Rahul.

Director
Joined: 29 Nov 2012
Posts: 898
Followers: 14

Kudos [?]: 1085 [0], given: 543

Re: Was 70 the average (arithmetic mean) grade on a class test? [#permalink]

### Show Tags

26 Sep 2013, 04:40
Is answer choice A.. a trap answer in this question?
_________________

Click +1 Kudos if my post helped...

Amazing Free video explanation for all Quant questions from OG 13 and much more http://www.gmatquantum.com/og13th/

GMAT Prep software What if scenarios http://gmatclub.com/forum/gmat-prep-software-analysis-and-what-if-scenarios-146146.html

Math Expert
Joined: 02 Sep 2009
Posts: 37102
Followers: 7251

Kudos [?]: 96428 [1] , given: 10751

Re: Was 70 the average (arithmetic mean) grade on a class test? [#permalink]

### Show Tags

26 Sep 2013, 07:54
1
KUDOS
Expert's post
1
This post was
BOOKMARKED
fozzzy wrote:
Is answer choice A.. a trap answer in this question?

I find nothing too tricky in the first statement.

Was 70 the average (arithmetic mean) grade on a class test?

(1) On the test, half of the class had grades below 70 and half of the class had grades above 70 --> {69, 71} answer YES but {69, 100} answer NO. Not sufficient.

(2) The lowest grade on the test was 45 and the highest grade on the test was 95 --> {45, 95} answer YES but {45, 69, 95} answer NO. Not sufficient.

(1)+(2) {45, 95} answer YES but {45, 69, 95, 95} answer NO. Not sufficient.

_________________
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Re: Was 70 the average (arithmetic mean) grade on a class test? [#permalink]

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09 Dec 2014, 06:22
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: Was 70 the average (arithmetic mean) grade on a class test?   [#permalink] 09 Dec 2014, 06:22
Similar topics Replies Last post
Similar
Topics:
The average (arithmetic mean) height of five of Peter’s friends is 70 2 25 Mar 2016, 02:33
What was Joe’s average (arithmetic mean) test score for the semester 1 07 Feb 2016, 09:57
1 In a given class, what is the average (arithmetic mean) height per pup 4 17 Dec 2014, 06:41
4 What is the average (arithmetic mean) of eleven consecutive 4 25 Jan 2008, 10:44
What is the average (arithmetic mean) of eleven consecutive 3 23 Dec 2007, 23:16
Display posts from previous: Sort by

# Was 70 the average (arithmetic mean) grade on a class test?

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 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.
user
The average (arithmetic mean) of 10, 20, and 30 is 5 more 2 01 Oct 2012, 03:05
What is the average (arithmetic mean) of j and k ? 1 06 Dec 2012, 05:23
1 Is the average (arithmetic mean) of a certain series of 2 18 Apr 2010, 12:45
6 If the average (arithmetic mean) of the five numbers x, 7, 5 30 Jun 2008, 08:07
4 Is the average (arithmetic mean) of five consecutive negative 6 11 Nov 2009, 04:03
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# Was 70 the average (arithmetic mean) grade on a class test?

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 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been