If the modal class of a frequency distribution is $70-85,$ then in the formula for mode,$l=$ ..........
- A$15$
- B$77.5$
- C$70$
- D$85$
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The formula to find the mean of an ungrouped data is ........
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Class $0-20$ $20-40$ $40-60$ $60-80$ $80-100$ Frequency $5$ $15$ $20$ $18$ $2$
| Class | $0-20$ | $20-40$ | $40-60$ | $60-80$ | $80-100$ |
| Frequency | $5$ | $15$ | $20$ | $18$ | $2$ |
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Class $0-10$ $10-20$ $20-30$ $30-40$ $40-50$ $50-60$ Frequency $4$ $5$ $9$ $10$ $14$ $8$
Total frequency $n = 50$.
| Class | $0-10$ | $10-20$ | $20-30$ | $30-40$ | $40-50$ | $50-60$ |
| Frequency | $4$ | $5$ | $9$ | $10$ | $14$ | $8$ |
Total frequency $n = 50$.
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