Cracking The SAT Premium

the units to make sure you know what the numbers on the axes represent. On this graph, horizontal lines
are drawn at 5 unit intervals, making the graph easier to read. If these lines do not appear on a bar graph,
use your answer sheet to determine the height of a given bar.

A bar chart question might look like this:

14.The  populations of  five    countries   are shown   in  the graph   above.  If  population  density is

defined as   ,  and the area    of  Paraguay    is  400,000 square  kilometers, what    is

the population  density of  Paraguay,   in  people  per square  kilometer?

A) 0.08

B) 0.8

C) 1.25

D) 12.5

Here’s How to Crack It

Start by determining the population of Paraguay. The bar hits right at the horizontal line for 5, which is in
millions, so there are 5 million people in Paraguay. Now use the definition of population density in the
question.

=

Be very careful with the number of zeroes you put in the fraction—the answer choices are pairs that vary
by a factor of 10, meaning the test writers expect you to miss a zero. The answer must be greater than 1,
since your numerator is bigger than your denominator, so eliminate (A) and (B). Choice (C) also seems
too small, but check the math on your calculator (carefully). You should get 12.5 people per square
kilometer, so (D) is correct.

The Two-Way Table

A two-way table is another way to represent data without actually graphing it. Instead of having the
variables represented on the vertical and horizontal axes, the data will be arranged in rows and columns.
The top row will give the headings for each column, and the left-most column will give the headings for
each row. The numbers in each box indicate the data for the category represented by the row and the
column the box is in.

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