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12.5 is the class mark of the class interval 

A) 10 – 15 

B) 0 – 25 

C) Both A and B 

D) None

2 Answers

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Best answer

Correct option is (C) Both A and B

\(\because\) Class mark \(=\frac{\text{lower limit of class + upper limit of class}}2\)

\(\therefore\) Class mark of the class interval 10–15 \(=\frac{10+15}2\)

\(=\frac{25}2\) = 12.5

Class mark of the class interval 0–25 \(=\frac{0+25}2\)

\(=\frac{25}2\) = 12.5

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Correct option is  C) Both A and B

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