Give formula for class - size and class mark and find them for class 20 -30
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Answer:
Class size=10,class mark=25
Step-by-step explanation:
Class size=upper limit - lower limit
=30-20
=10
(class mark means class interval)
Class mark=lower limit+upper limit
2
=20+30
2
= 50 =25
2
(class mark is the middle value of class)
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