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At a certain hospital, 75% of the interns receive fewer than

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At a certain hospital, 75% of the interns receive fewer than [#permalink] New post 03 Feb 2011, 08:23
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At a certain hospital, 75% of the interns receive fewer than 6 hours of sleep and report feeling tired during their shifts. At the same time, 70% of the interns who receive 6 or more hours of sleep report no feelings of tiredness. If 80% of the interns receive fewer than 6 hours of sleep, what percent of the interns report no feelings of tiredness during their shifts?

A. 6
B. 14
C. 19
D. 20
E. 81
[Reveal] Spoiler: OA

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Re: Tired Interns [#permalink] New post 03 Feb 2011, 08:49
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gmatpapa wrote:
At a certain hospital, 75% of the interns receive fewer than 6 hours of sleep and report feeling tired during their shifts. At the same time, 70% of the interns who receive 6 or more hours of sleep report no feelings of tiredness. If 80% of the interns receive fewer than 6 hours of sleep, what percent of the interns report no feelings of tiredness during their shifts?

A. 6
B. 14
C. 19
D. 20
E. 81
Given:



< 6 hours sleep>= 6 hours sleepTOTAL
Tired75--
Not Tired-0.7*X?
TOTAL80X100


Interns who receive < than 6 hours sleep and Not Tired = 80 - 75 = 5;

TOTAL interns who receive >= 6 hours sleep = 100 - 80 = 20, so interns who receive >= 6 hours sleep and are Not Tired = 0.7 * 20 =14;

Interns who are Not Tired = 5 + 14 = 19.

Answer: C.
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Re: Tired Interns [#permalink] New post 03 Feb 2011, 09:25
Bunuel wrote:
gmatpapa wrote:
At a certain hospital, 75% of the interns receive fewer than 6 hours of sleep and report feeling tired during their shifts. At the same time, 70% of the interns who receive 6 or more hours of sleep report no feelings of tiredness. If 80% of the interns receive fewer than 6 hours of sleep, what percent of the interns report no feelings of tiredness during their shifts?

A. 6
B. 14
C. 19
D. 20
E. 81
Given:



< 6 hours sleep>= 6 hours sleepTOTAL
Tired75--
Not Tired-0.7*X?
TOTAL80X100


Interns who receive < than 6 hours sleep and Not Tired = 80 - 75 = 5;

TOTAL interns who receive >= 6 hours sleep = 100 - 80 = 20, so interns who receive >= 6 hours sleep and are Not Tired = 0.7 * 20 =14;

Interns who are Not Tired = 5 + 14 = 19.

Answer: C.


Thanks!

Bunuel, this tabular method for solving Venn Diagram problems: is it explained anywhere with other examples?
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Re: Tired Interns [#permalink] New post 03 Feb 2011, 09:38
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gmatpapa wrote:
Thanks!

Bunuel, this tabular method for solving Venn Diagram problems: is it explained anywhere with other examples?


It's not a Venn Diagram problem, it's an overlapping sets problem which can be solved with Venn Diagram as well as with Double Matrix Method (which is often better).

You can check overlapping sets tag to see that some of the problems are solved with this method. Also check this link for video explanation: http://www.youtube.com/watch?v=uE_aMa_W0o0
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Re: Tired Interns [#permalink] New post 03 Feb 2011, 11:16
Very useful! Thanks
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Re: Sets problem - Tired [#permalink] New post 25 Jul 2011, 20:38
Expert's post
vatsas wrote:
At a certain hospital, 75% of the interns receive fewer than 6 hours of sleep and report feeling tired during their shifts. At the same time, 70% of the interns who receive 6 or more hours of sleep report no feelings of tiredness. If 80% of the interns receive fewer than 6 hours of sleep, what percent of the interns report no feelings of tiredness during their shifts?

a. 6
b. 14
c. 19
d. 20
e. 81

I need to understand the method to solve this problem. I tried the matrix method but failed. Is there any other method?

Thanks
Sumeet


You can just use logic or a Venn diagram, whatever works for you. I will give the logical solution below. Try to figure out the Venn diagram for it. Get back if it gets tricky.
Look at the given data line by line.

At a certain hospital, 75% of the interns receive fewer than 6 hours of sleep and report feeling tired during their shifts.

n(FEW and TIRED) = 75%

At the same time, 70% of the interns who receive 6 or more hours of sleep report no feelings of tiredness.
.... We will come back...

If 80% of the interns receive fewer than 6 hours of sleep,

n(FEW) = 80%
Therefore, n(Not FEW) = 20%
Also since n(FEW and TIRED) = 75%, n(FEW and Not TIRED) = 5%

Now we go back to the second sentence.
We know that n(Not FEW) = 20%. 70% of these are not tired.
So n(Not TIRED and Not FEW) = 70% of 20% = 14%

what percent of the interns report no feelings of tiredness during their shifts?

n(Not TIRED) = n(FEW and Not TIRED) + n(Not TIRED and Not FEW) = 5% + 14% = 19%

The notation is used only to explain it to you. You obviously don't need to do that. Just remember that when you get some data '80% people get less sleep,' it also implies that 20% get enough or more.
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Re: Sets problem - Tired [#permalink] New post 25 Jul 2011, 21:11
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the solution is in the table -
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Re: At a certain hospital, 75% of the interns receive fewer than [#permalink] New post 31 Mar 2012, 23:41
Let's assume total number of students are 1000.
80% of 1000 students gets <6 hrs of sleep = 800 (both tired and not tired)
75% of 1000 students gets <6 hrs and tired = 750
Therefore, students who get <6 hrs and not tired = 50..........(1)

20% of 1000 students gets >= 6 hrs of sleep = 200 (both tired and not tired)
70% of 200 students gets >=6 and not tired = 140.......(2)

(1) + (2) = 190 or 19% of total students. Hence C.
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At a certain hospital, 75% of the interns receive fewer than [#permalink] New post 15 Apr 2012, 14:31
option c.
we figure out at that 20% get more than 6 hours of sleep. then from there we know that 70% of those who get more than 6 hrs of sleep feel tired which is 14% + 5% = 19%
5% = 80-75
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Re: At a certain hospital, 75% of the interns receive fewer than [#permalink] New post 17 Apr 2012, 05:54
Thanks Bunuel for the link to the video
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At a certain hospital, 75% of the interns receive fewer [#permalink] New post 21 Jun 2012, 17:53
5% of 80 =4 but why you guys took it as 5% am I mistaking something :?:

hogann wrote:
asterixmatrix wrote:
80% receive less than 6 hours of sleep
75% report feeling tired so 5% dont feel tired

20% receive 6 or more hours of sleep
out of this 70% report no tiredness so it become 14%

total 5%+14% = 19%...C


Great Explanation - OA is 19%
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Re: Tuesday Q2 - Interns [#permalink] New post 21 Jun 2012, 20:58
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RichaMidha2012 wrote:
5% of 80 =4 but why you guys took it as 5% am I mistaking something :?:

asterixmatrix wrote:
80% receive less than 6 hours of sleep
75% report feeling tired so 5% dont feel tired

20% receive 6 or more hours of sleep
out of this 70% report no tiredness so it become 14%

total 5%+14% = 19%...C




A very important thing in percentages is to note what is the % of i.e. when I say 5%, it is 5% of what?

5% of total interns or 5% of interns who receive less than 6 hrs of sleep or 5% of interns who report tiredness etc

The question says:
75% of the interns receive fewer than 6 hours of sleep and report feeling tired during their shifts (75% of total interns)
If 80% of the interns receive fewer than 6 hours of sleep (again, 80% of the total interns)

So out of 80% of total interns i.e. if total interns are 100, 80 of them receive fewer than 6 hrs of sleep. Out of 100, 75 receive fewer than 6 hrs of sleep and report tiredness. Therefore, 5 receive fewer than 6 hrs of sleep but report no tiredness.
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Re: PS -700 level [#permalink] New post 28 Oct 2012, 22:56
AartiPajan wrote:
At a certain hospital, 75% of the interns receive fewer than 6 hours of sleep and report feeling tired during their shifts. At the same time, 70% of interns who receive 6 hours or more of sleep report no feeling of tiredness. If 80% of the interns receive fewer than 6 hrs sleep, what percentage of interns report no feelings of tiredness during their shift?

A. 6
B. 14
C. 19
D. 20
E. 81

Plz help... My solution says D. 20 while correct answer is C. 19 ..
Thanks in advance.


Creating a two overlapping set grid

____________Less Than 6________6 or more__________________Total
Tired__________75________________6______________________81
Not Tired________5_______________14______________________19
Total__________80_______________20_____________________100


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Re: At a certain hospital, 75% of the interns receive fewer than [#permalink] New post 16 Feb 2013, 11:00
Guys,
I am like SUPER CONFUSED right now :shock: .. I used the tabular method to solve the problem but it was just the opposite to the explanations (ie). Tired and not tired in the X axis, Receive < 6 hrs , >6 hours in the Y axis .. I know this would yield the same answer but im confused.. If someone could explain by drawing the grid the way i did.. id be really really grateful. And also, how do u choose which attribute to go where.. does that really matter??
Thanks in advance
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Re: At a certain hospital, 75% of the interns receive fewer than [#permalink] New post 16 Feb 2013, 11:39
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thinktank wrote:
Guys,
I am like SUPER CONFUSED right now :shock: .. I used the tabular method to solve the problem but it was just the opposite to the explanations (ie). Tired and not tired in the X axis, Receive < 6 hrs , >6 hours in the Y axis .. I know this would yield the same answer but im confused.. If someone could explain by drawing the grid the way i did.. id be really really grateful. And also, how do u choose which attribute to go where.. does that really matter??
Thanks in advance


for explanation, Pls go thru the attachment. see if it makes sense.

Regards,

Abhijit
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Re: At a certain hospital, 75% of the interns receive fewer than [#permalink] New post 17 Feb 2013, 20:28
Narenn wrote:
thinktank wrote:
Guys,
I am like SUPER CONFUSED right now :shock: .. I used the tabular method to solve the problem but it was just the opposite to the explanations (ie). Tired and not tired in the X axis, Receive < 6 hrs , >6 hours in the Y axis .. I know this would yield the same answer but im confused.. If someone could explain by drawing the grid the way i did.. id be really really grateful. And also, how do u choose which attribute to go where.. does that really matter??
Thanks in advance


for explanation, Pls go thru the attachment. see if it makes sense.

Regards,

Abhijit



Abhijit !
Thank you so much for the effort u ve put in. :-D
+1 to u
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Re: At a certain hospital, 75% of the interns receive fewer than [#permalink] New post 03 Mar 2013, 20:26
-------------Fewer than 6 / 6 or more
--not tired-- .75x.
--tired------ .05x. /------.14x-------/---.19x----
Total-----------.80x-------/------.20x-------/---x-------

Answer: C
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Re: Sets problem - Tired [#permalink] New post 07 Apr 2013, 16:19
agdimple333 wrote:
the solution is in the table -


I'm trying to understand why you had to calculate "70% of 20" but at the same time you left "5" untouched? Why would we take % of a %?
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Re: Sets problem - Tired [#permalink] New post 07 Apr 2013, 21:45
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gmat978 wrote:
agdimple333 wrote:
the solution is in the table -


I'm trying to understand why you had to calculate "70% of 20" but at the same time you left "5" untouched? Why would we take % of a %?


This post might help: at-a-certain-hospital-75-of-the-interns-receive-fewer-than-108658.html#p863611
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Re: At a certain hospital, 75% of the interns receive fewer than [#permalink] New post 05 Jul 2013, 01:27
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Re: At a certain hospital, 75% of the interns receive fewer than   [#permalink] 05 Jul 2013, 01:27
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