A two-way frequency table shows the number of students in 7t...

Question Analysis
This question tests the student's ability to calculate the joint relative frequency from a two-way frequency table. The key is to correctly identify the joint frequency and the total number of students surveyed.

Key Concept Explanation
Joint Relative Frequency: It is the ratio of the joint frequency (the number of students in a specific category) to the total number of the population. In this case, it is the number of 7th-grade students who prefer playing chess divided by the total number of students surveyed.

Step-by-step Solution
1. Identify the joint frequency: 54 students in 7th grade prefer playing chess.
2. Identify the total number of students surveyed: 180.
3. Calculate the joint relative frequency:

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Algebra-1

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