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"Life expectancy" is the average age at death of the entire

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Joined: 29 Jul 2012
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GMAT Date: 11-18-2012
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"Life expectancy" is the average age at death of the entire [#permalink] New post 09 Dec 2012, 06:02
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E

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  15% (low)

Question Stats:

72% (01:54) correct 28% (00:31) wrong based on 100 sessions
"Life expectancy" is the average age at death of the entire live-born population. In the middle of the nineteenth century, life expectancy in North America was 40 years, whereas now it is nearly 80 years. Thus, in those days, people must have been considered old at age that we now consider the prime of life.

Which of the following, if true, undermines the argument above?

a. In the middle of the nineteenth century, the population of North America was significantly smaller than is today.

b. Most of the gains in life expectancy in the last 150 years have come from reductions in the number of infants who die in their first year of life.

c. Many of the people who live to an advanced age today do so only because of medical technology that was unknown in the nineteenth century.

d. the proportion of people who die in their seventies is significantly smaller today than is the proportion of people who die in their eighties.

e. More people in the middle of the nineteenth century engaged regularly in vigorous physical activity than do so today.
[Reveal] Spoiler: OA

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Re: Life expectancy" is the average age at death of the entire [#permalink] New post 09 Dec 2012, 08:49
Expert's post
Only B weakens the conclusion that 40 year olds in the nineteenth century were considered old.
It says that the average went up because deaths of 1 year olds decreased dramatically.
So the people who are considered old remains to be of the same age.
Does this help?
Which option do you think is better?
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Manager
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Joined: 29 Jul 2012
Posts: 189
GMAT Date: 11-18-2012
Followers: 0

Kudos [?]: 30 [0], given: 23

Re: Life expectancy" is the average age at death of the entire [#permalink] New post 09 Dec 2012, 20:17
souvik101990 wrote:
Only B weakens the conclusion that 40 year olds in the nineteenth century were considered old.
It says that the average went up because deaths of 1 year olds decreased dramatically.
So the people who are considered old remains to be of the same age.
Does this help?
Which option do you think is better?


I didn't got argument
and i have chosen answer as 'A'
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Re: Life expectancy" is the average age at death of the entire   [#permalink] 09 Dec 2012, 20:17
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