For a given frequency distribution,the frequencies of the first,second,and third class are $8$,$15$,and $18$ respectively. Then,the cumulative frequency of the third class is $\ldots \ldots \ldots \ldots .$
- A$23$
- B$33$
- C$41$
- D$26$
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Find the mean of the following frequency distribution:
Class $10-20$ $20-30$ $30-40$ $40-50$ $50-60$ $60-70$ Frequency $2$ $10$ $40$ $25$ $13$ $10$
(in $.7$)
| Class | $10-20$ | $20-30$ | $30-40$ | $40-50$ | $50-60$ | $60-70$ |
| Frequency | $2$ | $10$ | $40$ | $25$ | $13$ | $10$ |
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