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65% of women with a bifid uterus, a uterus which is divided into two

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65% of women with a bifid uterus, a uterus which is divided into two [#permalink]

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New post 28 Aug 2015, 02:44
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65% of women with a bifid uterus, a uterus which is divided into two lateral horns as a result of imperfect fusion of the paramesonephric ducts, give birth prematurely. However, 95% of prematurely born infants are born to mothers whose uterus is not bifid.

The statements above, if true, best support which of the following as a conclusion?

A) 15% of women with a bifid uterus end up losing the fetus.
B) Some causes of premature birth reside in factors other than the physiology of the birth mother
C) A bifid uterus is not necessarily hereditary.
D) The birth weight of premature infants whose mothers have a bifid uterus is lower than that of premature infants whose mothers do not have a bifid uterus.
E) A bifid uterus is an uncommon condition among women.
[Reveal] Spoiler: OA

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Re: 65% of women with a bifid uterus, a uterus which is divided into two [#permalink]

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New post 28 Aug 2015, 06:01
Harley1980 wrote:
65% of women with a bifid uterus, a uterus which is divided into two lateral horns as a result of imperfect fusion of the paramesonephric ducts, give birth prematurely. However, 95% of prematurely born infants are born to mothers whose uterus is not bifid.

The statements above, if true, best support which of the following as a conclusion?

A) 15% of women with a bifid uterus end up losing the fetus.
B) Some causes of premature birth reside in factors other than the physiology of the birth mother
C) A bifid uterus is not necessarily hereditary.
D) The birth weight of premature infants whose mothers have a bifid uterus is lower than that of premature infants whose mothers do not have a bifid uterus.
E) A bifid uterus is an uncommon condition among women.


Hi

Can you please explain why B is incorrect answer

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Re: 65% of women with a bifid uterus, a uterus which is divided into two [#permalink]

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amatya wrote:
Harley1980 wrote:
65% of women with a bifid uterus, a uterus which is divided into two lateral horns as a result of imperfect fusion of the paramesonephric ducts, give birth prematurely. However, 95% of prematurely born infants are born to mothers whose uterus is not bifid.

The statements above, if true, best support which of the following as a conclusion?

A) 15% of women with a bifid uterus end up losing the fetus.
B) Some causes of premature birth reside in factors other than the physiology of the birth mother
C) A bifid uterus is not necessarily hereditary.
D) The birth weight of premature infants whose mothers have a bifid uterus is lower than that of premature infants whose mothers do not have a bifid uterus.
E) A bifid uterus is an uncommon condition among women.


Hi

Can you please explain why B is incorrect answer


Hello amatya

B is incorrect because from argument we know that premature birth can be caused not only by bifid uterus but by some other reasons. But we can not infer that these other reasons is not physiological.

In questions with percents usually very useful to make example with real numbers:
9000 mature infants - 9000 women
1000 premature infants - 1000 women
95% - 950 babies - from women without bifid uterus
5% - 50 babies - from women with bifid uterus so
65% of women with bifid uterus born 50 babies

So we have near 76 women with bifid uterus - 0.76% from all women and becuase of this we can say that bifid uterus is uncommon condition.
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Re: 65% of women with a bifid uterus, a uterus which is divided into two [#permalink]

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New post 31 Aug 2015, 01:08
E is pretty clear here.

Make it simple:
you have women with bifid uterus and women without.

--> Of the women with bifid uterus 65% experience premature birth.

--> However of the total of premature births 95% are women without bifid uterus

This shows that bifid uterus is pretty uncommon under women. If its still not clear I am happy to explain further. (Just make up some numbers if this helps)

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Re: 65% of women with a bifid uterus, a uterus which is divided into two [#permalink]

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New post 12 Oct 2015, 23:29
--------------Bifid-----Not bifid-----Total

Prem.-------0.65x-------0.95y-------y

Not prem.--0.35x

Total---------x

0.65x=0.05y => x/y=1/13, so bifid is uncommon

E

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Re: 65% of women with a bifid uterus, a uterus which is divided into two [#permalink]

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New post 28 Oct 2015, 02:57
Can anyone explain why D is incorrect?

Thanks

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Re: 65% of women with a bifid uterus, a uterus which is divided into two [#permalink]

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New post 20 Nov 2015, 06:27
vinnisatija wrote:
Can anyone explain why D is incorrect?

Thanks


Answer D is comparing the weight of premature infants whose mother have a bifid uterus with the weight of other premature infant. Nowhere in the argument you have any information about the weight of premature infant.

D is out of scope, you don't have any information to support option D.

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65% of women with a bifid uterus, a uterus which is divided into two [#permalink]

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New post 01 Nov 2017, 02:25
Harley1980 wrote:
B is incorrect because from argument we know that premature birth can be caused not only by bifid uterus but by some other reasons. But we can not infer that these other reasons is not physiological.

In questions with percents usually very useful to make example with real numbers:
9000 mature infants - 9000 women
1000 premature infants - 1000 women
95% - 950 babies - from women without bifid uterus
5% - 50 babies - from women with bifid uterus so
65% of women with bifid uterus born 50 babies

So we have near 76 women with bifid uterus - 0.76% from all women and becuase of this we can say that bifid uterus is uncommon condition.

Are the figures 76 and 0.76%, marked red, correct? I got 7.69% in my calculation.

Temurkhon wrote:
--------------Bifid-----Not bifid-----Total

Prem.-------0.65x-------0.95y-------y

Not prem.--0.35x

Total---------x

0.65x=0.05y => x/y=1/13, so bifid is uncommon

E


0.65x=0.05y => x/y=1/13--> 7.69%. How can we say that 7.69% bifid utereus is uncommon?
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Re: 65% of women with a bifid uterus, a uterus which is divided into two [#permalink]

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New post 08 Nov 2017, 23:27
I answered E too, but is still pretty incorrect it should have stated that bifid is uncommon among mothers not women!

Because it might be the case that bifid is common but the women who have it do not have children

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Re: 65% of women with a bifid uterus, a uterus which is divided into two [#permalink]

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New post 24 Nov 2017, 14:57
65% of women with a bifid uterus, a uterus which is divided into two lateral horns as a result of imperfect fusion of the paramesonephric ducts, give birth prematurely. However, 95% of prematurely born infants are born to mothers whose uterus is not bifid.


[b]95% prem. baby --> non bifid mothers. Lets imagine 5% prem. babies are born to bifid moms.
65% bifid mothers have prem babies. Rest we don't know.
1) +2) 5% prem. babies account for 65% women --> 5 in a 100 babies are borne premature to women who represent 65%. Thus it is possible that these women are very few in population. [/b]

The statements above, if true, best support which of the following as a conclusion?

A) 15% of women with a bifid uterus end up losing the fetus.-->After doing some hit and trial,this number seems unlikely. 65% give birth, but we cannot acc for the rest
B) Some causes of premature birth reside in factors other than the physiology of the birth mother. 'some'. Thats not what the stem says
C) A bifid uterus is not necessarily hereditary.irrelevant
D) The birth weight of premature infants whose mothers have a bifid uterus is lower than that of premature infants whose mothers do not have a bifid uterus.irrelevant
E) A bifid uterus is an uncommon condition among women.Correct, based on above

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Re: 65% of women with a bifid uterus, a uterus which is divided into two   [#permalink] 24 Nov 2017, 14:57
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