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Mathematics

If the lower and the upper limits of a class interval are 7.5 and 12.5, the class-mark is :

  1. 10

  2. 2.5

  3. 7.5

  4. 12.5

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Answer

Class mark of a class-interval=Upper class limit + Lower class limit2{\text {Class mark of a class-interval} = \dfrac{\text{Upper class limit + Lower class limit}}{2}}

=12.5+7.52=202=10= \dfrac{12.5 + 7.5}{2}\\[1em] = \dfrac{20}{2}\\[1em] = 10

Hence, option 1 is the correct option.

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