find only for above 9th class because ye 9th k formula se nahi karna
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Beautiful handwriting
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middle value between two interval or add two value and divide it by 2...if the given question is a continuous mean
Step-by-step explanation:
0+20=20/2=10
20+40=60/2=30
40+60=100/2=50
60+80=140/2=70
80+100=180/2=90
100+120=220/2=110
the mean difference for each interval is 20
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