Find the class mark of 10-20 in the intervals 0-10,10-20,20-30…
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1
Answer:
Correct option is B)
Class mark is the average of upper limit and lower limit of the given class interval.
Therefore, class mark of 20−30 interval is 220+30=250=25
Class mark of 10−20 interval is 210+20=230=15
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Answer:
class mark of 10-20 =15
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