Algebra-1

Question Analysis
The question tests the understanding of marginal frequencies in a two-way frequency table.

Key Concept Explanation
Marginal frequencies are the total values in the rows or columns of a two-way frequency table, indicating the total number of observations in a single category of one variable, regardless of the other variable.

Step-by-step Solution
1. Identify the given value: 45 (total number of 9th graders).
2. Recognize that this val...