501 Questions To Master GED Test Mathematics_pag316

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501 Questions to Master the GED® Mathematical Reasoning Test
 398. The correct answer is choice a. There are 5.5 house symbols 
used in the chart for San Diego, indicating 5.5 × 2,500 = 13,750 
subscribing households in that city.
 Choice b is incorrect. There are 5.5 house symbols, not 6 
(which would result in 15,000 subscribing households).
 Choice c is incorrect. This is the number of subscribing 
households in Sacramento.
 Choice d is incorrect. This is the number of subscribing 
households in San Francisco.
 399. The correct answer is a vertical line at 3. 
1 2 3 4 5 6 7 8
Hours Spent on Computer per Day
 A box plot or box-and-whisker plot is a type of graphic that shows 
five different benchmarks within a set of data: the minimum value, 
the maximum value, the upper quartile, the lower quartile, and 
the median. Looking at the given graph, we see that the minimum 
value of 1 and the maximum value of 8 are illustrated clearly. The 
median of a data set is the middle piece of data—there is an equal 
number of data points above and below it. The median is repre-
sented by the bar inside the box of the graph. Since 50% of the 
employees spent more than 3 hours on their computers, 3 is the 
median and there should be a center bar in the box at 3. The most 
frequent response from employees of 4 hours is the mode, but the 
mode is not a statistic that is represented in box-and-whisker plots. 
The mean time spent on computers of 4.5 hours is also not dis-
played since the arithmetic average is not shown in box-and- 
whisker plots. Once the additional bar showing the median is 
added, you can see that the overall distribution of time 
employees spent on their computers is skewed right.
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