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Definition of Histogram
A histogram is a bar graph that shows how frequently data occur within certain ranges or intervals. The height of each bar gives the frequency in the respective interval.
Examples of Histogram
The histogram shown below gives the number of children visited a particular zoo.

Solved Example on Histogram
The discounts offered by a super market are as shown in the table. Which of these histograms is the correct representation of the data?
Amount (in $)
Discount%
1,000 - 1,999
2
2,000 - 2,999
4
3,000 - 3,999
6
4,000 - 4,999
8
5,000 - 5,999
10


Choices:
A. Figure 1
B. Figure 2
C. Figure 3
D. Figure 4
Correct Answer: A
Solution:
Step 1: The heights of the bars in the histogram indicates the discount offered (in %) for the corresponding amount (in $).
Step 2: Observe the graphs to match the heights of the bars in each graph with the values in the table.
Step 3: It can be observed that the heights of the bars in Figure 1 matches with the values in the table.
Step 4: So, Figure1 is the correct representation of the data.