GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 22 Aug 2019, 02:08

### 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

# If there are 32 guests at a party, what is the average (arithmetic mea

Author Message
TAGS:

### Hide Tags

Manager
Joined: 24 Dec 2016
Posts: 60
Location: United States
Concentration: Statistics
Schools: Duke Fuqua
GMAT 1: 720 Q49 V40
GPA: 3.38
If there are 32 guests at a party, what is the average (arithmetic mea  [#permalink]

### Show Tags

22 Jun 2017, 12:18
00:00

Difficulty:

15% (low)

Question Stats:

89% (00:50) correct 11% (00:57) wrong based on 27 sessions

### HideShow timer Statistics

If there are 32 guests at a party, what is the average (arithmetic mean) age of the guests?
(1) The sum of the ages of the guests is 1536 years
(2) The youngest guest, Tracy, is 24 years old and the oldest guest, Pat, is 68 years old

_________________
If you find my solution useful, hit the "Kudos" button
Senior PS Moderator
Joined: 26 Feb 2016
Posts: 3355
Location: India
GPA: 3.12
Re: If there are 32 guests at a party, what is the average (arithmetic mea  [#permalink]

### Show Tags

22 Jun 2017, 12:28
1
(1) The sum of the ages of the guests is 1536 years
Knowing the sum of the guest's age and the total number of guests, we can compute mean by using formula
Average(mean) = Total(sum of ages)/Number of guests.
Hence, sufficient.

(2) The youngest guest, Tracy, is 24 years old and the oldest guest, Pat, is 68 years old
Another method of finding the mean for a set of numbers is
Average(mean) = (First element + Last element)/2
However, this is possible if and only if the numbers are in a AP.
Here we do know the first and last element, but we don't know if the numbers are in an AP.
Hence, insufficient. (Option A)

_________________
You've got what it takes, but it will take everything you've got
Director
Joined: 04 Dec 2015
Posts: 744
Location: India
Concentration: Technology, Strategy
WE: Information Technology (Consulting)
If there are 32 guests at a party, what is the average (arithmetic mea  [#permalink]

### Show Tags

22 Jun 2017, 12:29
Vardan95 wrote:
If there are 32 guests at a party, what is the average (arithmetic mean) age of the guests?
(1) The sum of the ages of the guests is 1536 years
(2) The youngest guest, Tracy, is 24 years old and the oldest guest, Pat, is 68 years old

Average = Sum of ages / total number of guests

Given total number of guests $$= 32$$

(1) The sum of the ages of the guests is 1536 years.

Average $$= \frac{1536}{32} = 48$$

I is Sufficient.

(2) The youngest guest, Tracy, is 24 years old and the oldest guest, Pat, is 68 years old.

We cannot find the sum of ages of the guests. Hence II is Not Sufficient.

_________________
Please Press "+1 Kudos" to appreciate.
Non-Human User
Joined: 09 Sep 2013
Posts: 12064
Re: If there are 32 guests at a party, what is the average (arithmetic mea  [#permalink]

### Show Tags

10 Aug 2019, 19:03
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: If there are 32 guests at a party, what is the average (arithmetic mea   [#permalink] 10 Aug 2019, 19:03
Display posts from previous: Sort by