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Mathematics

The class-mark of class 19 - 30 is:

  1. 30+192\dfrac{30 + 19}{2}

  2. 29.5−19.52\dfrac{29.5 - 19.5}{2}

  3. 30.5−192\dfrac{30.5 - 19}{2}

  4. 29.5−18.52\dfrac{29.5 - 18.5}{2}

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Answer

By formula, class-mark = Lower limit + Upper limit2\dfrac{\text{Lower limit + Upper limit}}{2}

Substituting the values, we get :

Class-mark of class 19 - 30 = 19+302\dfrac{19 + 30}{2}

Hence, option 1 is the correct option.

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