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According to the chart shown, which of the following is [#permalink]
12 Dec 2012, 02:05

2

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00:00

A

B

C

D

E

Difficulty:

25% (medium)

Question Stats:

60% (01:57) correct
40% (00:55) wrong based on 311 sessions

Attachment:

Shipments.png [ 60.45 KiB | Viewed 3634 times ]

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?

Re: According to the chart shown, which of the following is [#permalink]
12 Dec 2012, 02:10

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Expert's post

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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?

We have 11 (odd) data points (from 1990 to 2000, inclusive), thus the median of these 11 numbers would be the middle term (6th largest number), when arranged in ascending order.

The 6th largest number, the 6th tallest bar, is for year 1994, which corresponds to approximately 310,000.

Re: According to the chart shown, which of the following is [#permalink]
13 Apr 2013, 04:56

Dummies like myself tend to start questions from the basics

Before starting, you need to know how to calculate the Median value - The Median is the "middle number" (in a sorted list of numbers).

To find the Median number, you need to know how many numbers there are in a set, its' total could either be even or odd. For example

Set 1 ( 2, 5, 6, 7, 8 ) = 5 numbers (odd), the Median value is the 3rd number, 5.

Set 2 ( 2, 4, 6, 8, 10, 11) = 6 numbers (even)0, the Median value is average of the two middle valudes, e.g. (6+8)/2= 7

In the question, 1990 - 2000, there are 11 (odd) numbers in the chart, you will have to sort their values from the lowest to the highest and count the 6th number.

Re: According to the chart shown, which of the following is [#permalink]
30 Apr 2013, 21:11

Here's a way of doing this problem, without breaking your head is to number the years from left to right, so for 1990, I used 1. 1992, 2, 1993, 3. .....etc. Then list the same digits in terms of highest value starting from the highest number on the left so for the highest I chose year 9, to the lowest number ( i chose year 1). Make sure you double check the count, so if it's 11 years, you must have 11 digits, organize then pick your median.

In my sequence of numbers I got 9-8-7-10-6-5-4-3-11-2-1, median number shows 5.

Re: According to the chart shown, which of the following is [#permalink]
30 Apr 2013, 21:47

1

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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?

Without finding value of each bar, it is possible to find out the middle value in 30 sec as the picture is simple enough.

There are 11 bars, so there will 5 taller and 5 shorter bars than the median. First four bars and last bar in the picture are the shortest 5 bars. Bar number 6-10 in the picture are tallest 5 bars. So the median is the value of 5th bar in the picture, which is little above 300,000. So the approximate value must be 310,000 (Option C).

Re: According to the chart shown, which of the following is [#permalink]
17 Dec 2013, 08:51

I'm sorry I feel very foolish for getting this wrong and I'm sure this question will sound just as foolish.

I correctly found which bar was the Median bar on the graph (because I know how to find the median) but then estimated that the value of that bar was 325,000 (D). Am I just supposed to be better at reading graphs to know that it's supposed to be 310? I just don't understand how I'm supposed to know that the median bar on the graph is 310 without any other numerical help besides the 100,000 increments on the right. I would definitely get this wrong on the real exam for the same reason.

Re: According to the chart shown, which of the following is [#permalink]
17 Dec 2013, 08:56

1

This post received KUDOS

Expert's post

Rdotyung wrote:

I'm sorry I feel very foolish for getting this wrong and I'm sure this question will sound just as foolish.

I correctly found which bar was the Median bar on the graph (because I know how to find the median) but then estimated that the value of that bar was 325,000 (D). Am I just supposed to be better at reading graphs to know that it's supposed to be 310? I just don't understand how I'm supposed to know that the median bar on the graph is 310 without any other numerical help besides the 100,000 increments on the right. I would definitely get this wrong on the real exam for the same reason.

Well, 6th tallest bar, is a bit more than 300,000 so approximately 310,000.

325,000 would be 300,000 and 1/4th of the increment and the bar for 1994 is less than that. _________________