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# A certain laboratory is studying the incidence of fatal liver damage

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Math Expert
Joined: 02 Sep 2009
Posts: 48037
A certain laboratory is studying the incidence of fatal liver damage  [#permalink]

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25 Jul 2018, 04:28
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75% (hard)

Question Stats:

51% (02:00) correct 49% (01:56) wrong based on 69 sessions

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A certain laboratory is studying the incidence of fatal liver damage in rats. Sixty-five percent of all rats whose environments exposed them to low levels of the toxin sulfur dioxide died of liver disorder. Ninety percent of all rats who died of liver disorder, however, were not exposed to any environmental toxins

Which of the following would provide a feasible explanation for the statistics above?

(A) Environmental and nonenvironmental causes of liver disease in rats are mutually exclusive.

(B) There is only one cause of fatal liver disease in rats.

(C) Environmental toxins are not particularly dangerous to the livers of rats.

(D) Only a small portion of the entire group of rats studied was exposed to environmental sulfur dioxide.

(E) Most rats will not suffer from exposure to low levels of sulfur dioxide.

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Re: A certain laboratory is studying the incidence of fatal liver damage  [#permalink]

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25 Jul 2018, 04:40
Ans: [IMO] D

Stem says that 65% of rates died who were exposed to SDO but this makes only <11% of the total deats (due to Liver failure)
There must be an alternate explanation and it can be If this 65% is just a small part of total number of experimental rats.
D follows this Idea.

Bunuel wrote:
A certain laboratory is studying the incidence of fatal liver damage in rats. Sixty-five percent of all rats whose environments exposed them to low levels of the toxin sulfur dioxide died of liver disorder. Ninety percent of all rats who died of liver disorder, however, were not exposed to any environmental toxins

Which of the following would provide a feasible explanation for the statistics above?

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Re: A certain laboratory is studying the incidence of fatal liver damage  [#permalink]

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25 Jul 2018, 04:46
Bunuel wrote:
A certain laboratory is studying the incidence of fatal liver damage in rats. Sixty-five percent of all rats whose environments exposed them to low levels of the toxin sulfur dioxide died of liver disorder. Ninety percent of all rats who died of liver disorder, however, were not exposed to any environmental toxins

Which of the following would provide a feasible explanation for the statistics above?

(A) Environmental and nonenvironmental causes of liver disease in rats are mutually exclusive.

(B) There is only one cause of fatal liver disease in rats.

(C) Environmental toxins are not particularly dangerous to the livers of rats.

(D) Only a small portion of the entire group of rats studied was exposed to environmental sulfur dioxide.

(E) Most rats will not suffer from exposure to low levels of sulfur dioxide.

We are talking of stats so let's see them..
1) 65% of exposed rats died of liver disorder
2) 90% of total deaths were of rats not exposed..
So 10% of total deaths were of rats exposed
Thus 10% of total =65% of exposed...
So exposed =100*10/65=200/13=~15.5%

Choice D gives these stats in words by saying that only a small portion was exposed ..

D
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Re: A certain laboratory is studying the incidence of fatal liver damage &nbs [#permalink] 25 Jul 2018, 04:46
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