A) 12.5-17.5
B) 17.5-22.5
C) 18.5-21.5
D) 19.5-20.5
Correct Answer: B
Solution :
Class mark = \[\frac{\text{upper}\,\text{limit+lowelimit}}{\text{2}}\] From the given options. 17.5-22.5 is the required class Sine,\[\frac{17.5+22.5}{2}=20\]
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