Explanation
Solution
To find the range in which the minimum qualifying marks lie, we need to look at the "Chemistry" row and identify where the number of students meets or exceeds the requirement of 23.
1. Analyzing the Data for Chemistry
From the table, we observe the cumulative distribution of marks for Chemistry:
Number of students scoring 40 and above: undefined
Number of students scoring 30 and above: undefined
Number of students scoring 20 and above: undefined
2. Identifying the Requirement
The problem states that at least 23 students are eligible.
At a qualifying mark of 30, only 21 students are eligible. This is less than the required 23.
At a qualifying mark of 20, 66 students are eligible. This is more than the required 23.
3. Determining the Range
Since the number of eligible students jumps from undefined (at 30 marks) to undefined (at 20 marks), the point at which the count reaches 23 must fall somewhere between these two benchmarks.
Therefore, the minimum qualifying marks (undefined) must satisfy:
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