Reading and Creating Graphs
Learn reading category counts, comparing graph values.
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Reading Category Counts
Objective: Explain reading category counts, apply the stated method, and check its conditions.
A bar chart compares counts or values in categories. Read the axis scale and labels before adding values. Counts can be totaled only when categories are nonoverlapping and the same observational unit is used throughout. Check units and whether categories overlap before adding counts.
Formulas
- Total = sum of nonoverlapping category counts
Worked examples
Try itA bar chart lists 42 apples, 49 pears, and 7 oranges. Find the total fruit count.Show answer
Step 1: Each bar gives a count in the same unit. Step 2: Add 42+49+7. Step 3: Total count is 98.
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