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The class mark of class interval 60 – 70 will be
  • a)
    75
  • b)
    65
  • c)
    70
  • d)
    60
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The class mark of class interval 60 – 70 will bea)75b)65c)70d)60...
class mark = [lower class interval + upper class interval]/2

= (60+70)/2

= 130/2

= 65 

(if the intervals are of uniform width)
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Community Answer
The class mark of class interval 60 – 70 will bea)75b)65c)70d)60...
Class mark=lower marks+upper mark ——————————————
2


60+70
-----------
2



130
--------
2


65
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