Algebra-1

Question Analysis
This question tests the student's ability to calculate the joint relative frequency using the given data from a two-way frequency table. The joint relative frequency is the ratio of the number of 11th-grade students who play tennis to the total number of students.

Key Concept Explanation
Joint Relative Frequency: It is obtained by dividing a joint frequency (the number of 11th-grade students who play tennis) by the total number of the population (total number of students).

Step-by-step Solution
1. Identify the joint frequency: 50 students in the 11th grade who play tennis.
2. Identify the total number of students: 140.
3. Calculate the joint relative frequency: .
4. Simplify the fraction:

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