A survey of 180 students found that 72 students in the 10th ...

Question Analysis
This question tests the student's ability to calculate the marginal relative frequency after a change in the total population. The key is to understand how the addition of new students affects the marginal relative frequency.

Key Concept Explanation
Marginal Relative Frequency: It is the ratio of the marginal frequency (the number of students in a single variable category) to the total number of the population. In this case, it is the proportion of 10th-grade students among the total number of students.

Step-by-step Solution
1. Identify the initial marginal frequency of 10th-grade students: 72.
2. Determine the new total number of students: 180 + 40 = 220.
3. Calculate the new marginal frequency of 10th-grade students: 72 + 40 = 112.
4. Calculate the new marginal relative frequency:

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Algebra-1

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