Geometry

Question Analysis
This question involves interpreting a bar chart, a common graphical representation in statistics.
The main focus is on comparing the heights of the bars to determine the least popular category.

Key Concept Explanation
In a bar chart, the height of each bar represents the frequency or quantity of a particular category.
By comparing the heights, we can identify the category with the lowest or highest value.

Step-by-Step Solution
Examine the heights of the bars for each pet category in the bar chart.
The number of students who own dogs is 15, cats is 12, fish is 8, and birds is 5.