MathematicsFind the class mark of classes 10-25  and 35-55.

Find the class mark of classes 10-25  and 35-55.


  1. A
    17.5 and 45.5
  2. B
    17 and 45.5
  3. C
    17.5 and 45
  4. D
    45 and 17.5 

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    Solution:

    Classes 10-25  and 35-55 are given.
    We know that the class mark is generally average of the upper and lower limit of a classes intervals and the classes size is the difference of the upper and lower limits of a classes intervals.
    From the data given in the question,
    Class mark=Upper Limit + Lower Limit2
    Find the required class mark.
    Class mark  of 10-25=10 + 252
    ⇒ Class mark of 10-25=17.5
    And the class mark of 35-55=35 +552
    ⇒ Class mark of 35-55=45 Thus, the class mark of 10-25 is 17.5 and class mark of 35-55 is 45.
    Hence, option 3 is correct.
     
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