with the most diamonds on it. That line is 7.2, which means that when the lake was tested, the pH level
most often read 7.2. The correct answer is (A).
What Is a Range?
The range of a list of numbers is the difference between the greatest number on the list and the least
number on the list. For the list 4, 5, 5, 6, 7, 8, 9, 10, 20, the greatest number is 20 and the least is 4, so the
range is 20 – 4 = 16.
3.
The forecasted monthly sales of Always Sunny Sunscreen are presented in the figure
above. Which of the following best describes the range of monthly sales, in millions of
dollars, throughout the year shown?
A) 2.5
B) 3.5
C) 4.0
D) 4.5Here’s How to Crack It
The range of a set of values is the difference between the greatest and the smallest value. Looking at the
chart, the lowest monthly sales number for Always Sunny can be found where the line dips closest to the
bottom of the graph. This happens in both January and March, when the forecasted sales are 2 million.
Make sure to read the units carefully. The highest point is where the line goes closest to the top of the
graph. This happens in July and August, when the forecasted monthly sales are 6.5 million. Therefore, the
range is 6.5 million – 2 million = 4.5 million. The correct answer is (D).
By the way, you may recognize this graph from Chapter 11. On the SAT, the same chart or figure may be