Algebra-1

Question Analysis
This question uses the table, focusing on the "Swimming" column.
The main focus is on determining the marginal frequency for students who participate in swimming.

Key Concept Explanation
Marginal Frequency (Column): The total number of observations in a column, calculated by summing all joint frequencies within that column. It shows the total count for one variable (e.g., all students in swimming, regardless of grade).

Step-by-Step Solution
Locate the column labeled "Swimming".
The marginal frequency for this column is the "Column Total" at the bottom of the column, which is 80.<...