The class mark of a class is $25$ and if the upper limit of that class is $40$ then its lower limit is _____

30

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20

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15

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10

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Solution

The correct option is B $10$
$Class mark = \frac{Lower limit + Upper limit}{2}$
$\Rightarrow 25 = \frac{Lower limit + 40}{2}$
$\Rightarrow Lower limit = 50 - 40 = 10$

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The class mark of a class is 25 and if the upper limit of that class is 40 then its lower limit is _____

The correct option is B 10Class mark=Lower limit+Upper limit2⇒25=Lower limit+402⇒Lower limit=50−40=10

The class mark of a class is $25$ and if the upper limit of that class is $40$ then its lower limit is _____

The correct option is B $10$
$Class mark = \frac{Lower limit + Upper limit}{2}$
$\Rightarrow 25 = \frac{Lower limit + 40}{2}$
$\Rightarrow Lower limit = 50 - 40 = 10$