501 Questions To Master GED Test Mathematics_pag314

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501 Questions to Master the GED® Mathematical Reasoning Test
 390. The correct answer is choice a. Since $85 represents the median 
and $90 represents the upper quartile, we can conclude that 25% 
of the data falls between $85 and $90. 
 Choice b is not correct because 50% of the data is either the range 
demonstrated by the box ($50 to $90), the range from the mini-
mum to the median ($30 to $85), or the range from the median 
to the maximum ($85 to $110). 
 Choice c is incorrect because 75% of the books are lower than $90 
but higher than $30, but the books between $85 and $90 are not 
75% of the data.
 391. The correct answer is 9%. To find the difference between food 
expense and the combined total of transportation and clothing 
expenses, look at the numbers on the graph. Food expense is 22%, 
transportation is 9%, and clothing is 4%; 22 – (9 + 4) = 9%.
 392. The correct answer is 30%. In a pie chart, all of the percentages 
must sum to 100%. When adding all the other given percentages 
together, we get 70%, so this means that 30% is left for housing.
 393. The correct answer is choice a. When looking at a scatter plot of 
data points, a correlation exists if there is a relationship between x 
and y that holds true for the majority of the points. For example, if 
the y-values get larger as the x-values get larger, there is a positive 
correlation. In other words, if the points seem to rise as you move 
from left to right on the graph, there is a positive correlation. Simi-
larly, if the y-values get smaller as the x-values get larger, there is 
a negative correlation; the values are behaving in an opposite way 
to each other. According to this scatter plot, there is a distinct rela-
tionship. As the x-values get larger, so do the y-values. Therefore, 
there is a positive correlation.
 Choice b is incorrect because if there were a negative correlation, 
the points would be sloping downward to the right, not upward 
to the right.
 Choice c is incorrect because if there were no correlation, the 
points would not be clustered together as they are on this scatter 
plot.
 Choice d is incorrect because the values are not necessary when 
determining if a positive or negative correlation exists in a 
scatter plot.
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