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Consider the given data :
The difference of lower limit of the median class and upper limit of the modal class is :
| Class | $0-20$ | $20-40$ | $40-60$ | $60-80$ | $80-100$ | $100-120$ |
|---|---|---|---|---|---|---|
| Frequency | $15$ | $30$ | $50$ | $63$ | $35$ | $32$ |
- (a)$0$
- (b)$20$
- (c)$40$
- (d)$10$
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Ans: (B) $20$