Histogram

Histogram

WARM UP

Multiple Choice

How many employees have a salary less than P 22,000?

• 50

• 350

• 0

• 10

Multiple Choice

How many people watched more than 6 hours of TV?

• 10

• 5

• 20

• 17

Multiple Choice

Which interval has the greatest number of students?

• 48-51

• 56-59

• 60-63

• 64-67

Multiple Choice

Which interval has the greatest number of employees?

• 11-21

• 33-43

• 77-87

• 44-54

HISTOGRAM

Graph that displays the data by using vertical bars of various heights to represent the frequencies of the classes.

To Construct a Histogram

1. Draw and label the x and y axis.

2. Represent the frequency on the y-axis and the class boundaries on the x-axis.

3. Using the frequencies as the heights, draw the vertical bars for each class.

Frequency Polygon

Graph that uses lines that connect the points plotted for the frequencies at the midpoint of the classes; frequencies are represented by the heights of the points.

To Construct a Frequency Polygon

1. Find the midpoints of each class. Draw the x and y axes.

2. Label the x-axis with the midpoint of each class then use a suitable scale for the frequencies on the y-axis.

3. Using the midpoints for the x values and the frequencies on the y-axis.

4. Connect adjacent points with the line segments.

5. Draw the line back to the x-axis at the beginning and the end of the graph (where the next midpoints would be located).

Multiple Choice

Do you have any questions?