Algebra-1

Question Analysis
This question focuses on the "7th Grade" row in the table.
The main focus is on finding the marginal frequency for 7th graders, regardless of their sport participation.

Key Concept Explanation
Marginal Frequency (Row): The total number of observations in a row, found by summing the joint frequencies within that row. It represents the total count for one category of the row variable (e.g., all 7th graders, whether in track or swimming).

Step-by-Step Solution
Find the row labeled "7th Grade".
The marginal frequency for this row is the "Row Total" at the end of the row, which is 76.
(Verification: Add ...