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Mathematics

The difference between the class marks of classes 20 - 25 and 45 - 65 is :

  1. 30

  2. 32.5

  3. 35

  4. 37.5

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Answer

As we know,

Class mark = Lower limit + Upper limit2\dfrac{\text{Lower limit + Upper limit}}{2}

Class mark = 20+252=452\dfrac{20 + 25}{2} = \dfrac{45}{2} = 22.5

Class mark = 45+652=1102\dfrac{45 + 65}{2} = \dfrac{110}{2} = 55

Difference = 55 - 22.5 = 32.5

Hence option 2 is the correct option.

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