Asad wrote:
Walkabout wrote:
Attachment:
Shipments.png
According to the chart shown, which of the following is closest to the median annual number of shipments of manufactured homes in the United States for the years from 1990 to 2000, inclusive?
(A) 250,000
(B) 280,000
(C) 310,000
(D) 325,000
(E) 340,000
Hello experts,
VeritasKarishma,
EMPOWERgmatRichC,
ArvindCrackVerbal,
AaronPond,
GMATinsightIf someone (student) has a little bit eye problem, how s/he make decision between C and D?
Thanks__
Hello Asad,
I'll refrain from commenting on the biological constraints that a student might have. However, he/she can certainly improve his/her estimation and approximation skills.
In a bar graph like the one in this question, learn to observe the intervals in the vertical direction (the horizontal axis represents ‘Time’ most often) . In this graph, the interval is that of 100,000 units.
Once this is done, you need to have certain fixed points like the below:
If the top of a bar is exactly in between the upper and the lower interval, it is 50,000. This is the halfway mark.
If the top of a bar is exactly in between the halfway mark and the lower interval, take it as 25,000.
If the top of a bar is exactly in between the halfway mark and the upper interval, take it as 75,000.
Now, we come to the most interesting part which has probably necessitated this question.
What if the bar ends just above the lower interval? Or just below the upper interval? For example, what would be the value for 1990? I’d take it as 190,000. What about 1994, you ask! I’d take 310,000. How about 1992? I’d assume it as 220,000 but if you assumed it as 225,000, our answers would not be a world apart.
Remember that if you find a similar question on the GMAT, the question will probably accommodate the fact that two different students will interpret the same bar in the way we did. As such, the answer options may not be really very close for you to worry about going wrong if your estimation was slightly off. In fact, in a lot of questions, GMAT expects you to approximate/estimate and rewards you if you do.
So,
do not worry about your approximated values not matching exactly with someone else’s,
as long as you are not making vague approximations.
Hope that helps!
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