MathematicsThe class marks of the class 18-22 is:

The class marks of the class 18-22 is:


  1. A
       4
  2. B
       18
  3. C
       22
  4. D
       20 

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    Solution:

    Given that the class interval is 18-22.
    Here, upper limit = 18 and lower limit = 22.
    We know,
    The class mark is calculated by,
    Class mark = Upper limit + lower limit 2  
    Thus, the class mark of 18-22 is,
    Class mark = 18+22 2  
    Class mark = 20
    Hence the class mark of the class 18-22 is 20.
    Therefore, the correct answer is option (4).
     
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