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Q.

What is the class-mark of class 25−35  ?

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a

60  

b

25  

c

30    

d

35  

answer is D.

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Detailed Solution

It is given class 25−35  .
Here upper limit is 35 and lower limit is 25.
We know that, class mark= (Lower limit + Upper limit)2
  ⇒ 25+35 2 =30   Therefore the class-mark of class 25−35   is 30.
Hence, option 4 is the correct answer.
 
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