Making Histograms

Histograms

Learning Objectives

• Read and interpret histogram with equal interval

• Read and interpret histogram to find the frequency density of different classes

What is a histogram?

• A specialized graph looks like a bar chart

• Normally used to show a distribution of continuous or grouped data

Example 1

​Example 2

Example 3

• How many trees are less than or equal to 5 m?

• How many trees are 20 m or taller?

Multiple Choice

How many trees are at least 15 feet tall?

• 12 trees

• 2 trees

• 9 trees

• 41 trees

Multiple Choice

21. How many students are represented by the histogram?

• Cannot be determined

• 9

• 31

• 35

Multiple Choice

How many students are between 48 and 51 inches tall?

• 14

• 8

• 2

• 0

Multiple Choice

What is an interval?

• A single number
• A range of numbers
• A percentage
• A total amount

Multiple Choice

Which interval has 400 employees?

• 33-43

• 0-10

• 77-87

• 66-76