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In the exam, the average grade of students who passed was and the average of students who failed was The average grade of the test takers was Find the percentage of students who took the exam and failed in ?

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answer is A.

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Detailed Solution

Concept:
Pass, fail, and sum must be considered in variables such as

, respectively, so based on the given question,

and

You can see that. Looking at these equations, we can see the value of ca. This is the percentage of students who failed the exam.
Let pass

, fall

and total

Thus,

(1)

Hence, the correct option is 1)

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