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Q.

Find the Class Marks of Classes 30-35, 35-40, and 40-45 in the data below.


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a

30, 35, 40

b

32.5, 37.5, 42.5

c

35, 40, 45

d

None of these 

answer is B.

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Detailed Solution

Classmark of a class interval with upper limit u and lower limit l is given by l+u2.
Class mark of 30-35 is 30+352=652=32.5.
Class mark of 35-40 is 35+402=752=37.5.
Class mark of 40-45 is 40+452=852=42.5.
  
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