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# Graphs for CBEST Exam Study Guide

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Updated on Mar 29, 2011

Graphs are found in both the reading and the math sections of the test. This section will give examples of the different types of graphs you may encounter on the CBEST. Try your hand at the sample graphs and questions in this section.

### Histograms and Bar Graphs

1. Between which two months was the change in profits for ZXC the greatest?
1. February and March
2. March and April
3. April and May
4. May and June
5. June and July
2. Between which two months did the profits for ZXC increase the most?
1. February and March
2. March and April
3. April and May
4. May and June
5. June and July

1. b. The change was the greatest between March and April. Choice a is irrelevant, as February is not mentioned on the graph.
2. c. April's bar ends on the downward side. Measuring with a piece of paper, you can see that it is farther from April's bottom to May's top than it is from May's top to June's top. You could also use the numbers for these months to determine when the greatest increase occurred.

### Line Graphs

1. In what year is the increase in student population projected to be less than the increase in the number of new homes built?
1. 2009
2. 2010
3. 2011
4. 2012
5. 2013

The answer is choice c. A look at the graph shows that for 2011 to 2012, there was a sharper increase in the number of new homes built than in student population. The line slopes up more steeply there for houses than it does for student population. Percent of increase is a different question and might yield a different answer. Check Ratios, Proportions, and Percents (page 114) for details on percents.

### Picture Graphs

1. How many MTAC members were there in 2000?
1. 350
2. 700
3. 1,750
4. 2,250

It is important to read the key at the bottom of the graph. Each piano represents 500 members. Half a piano represents 250 members. The year 2000 has pianos. This represents 1,750 members. The answer is choice d.

### Circle Graphs

1. Which category represents approximately of the income for the Save the Caves Foundation?
1. Mailings
2. Sales
3. Thrift Shop
4. Phone
5. Other

Look for the section that takes up approximately of the circle. The answer is choice a.

Here's a different kind of circle graph question.

1. Which of the following could include a representation of expenditures of 25% and 33%?

Twenty-five percent is the same as . Thirty-three percent is close to The only choice with areas of and of the circle is choice d. Choice b is close, but the larger area seems a little large for .

### Oddballs

Some graphs are just plain odd.

1. The circles above represent the dials on an electric meter. What reading do they represent?
1. 476
2. 465
3. 466
4. 486
5. 487

There are no clues whatsoever on the graphs. A look at the answer choices reveals that all are three digits and that all begin with the digit 4. It follows that each circle represents a digit. If so, the first dial has to represent 4. If the first dial represents 4, and the arrow is nearly halfway around (assuming the dials go clockwise), then half is probably 5. In that case, the last circle represents 5, which tells you your answer, choice b. It makes sense that the middle digit of 465 is 6, since the middle circle's arrow goes just a bit past the 5 mark. Questions similar to this one have appeared on the test, so it's important that you be prepared to think creatively.

All right, here's a challenge.

1. Which number best represents the speed indicated on the speedometer above?
1. 35
2. 45