In a two-way frequency table, if the joint frequency of 9th ...

Question Analysis
This question tests the ability to calculate marginal frequencies by summing the joint frequencies in the same column.

Key Concept Explanation
Marginal frequencies can be obtained by summing the joint frequencies in the same row or column. For example, the sum of the joint frequencies in a column is the marginal frequency of that column.

Step-by-step Solution
1. Identify the joint frequencies for 9th and 10th graders playing volleyball (12 and 8, respectively).
2. Sum these joint frequencies:

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Algebra-1

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