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(D) The cumulative frequency of a class is the sum of the frequencies of all classes up to that class.Let $cf_n$ be the cumulative frequency of the $n

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$15$

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(D) The cumulative frequency of a class is the sum of the frequencies of all classes up to that class.Let $cf_n$ be the cumulative frequency of the $n^{th}$ class and $f_n$ be the frequency of the $n^{th}$ class.We know that $cf_n = cf_{n-1} + f_n$.Therefore,$cf_{n-1} = cf_n - f_n$.Given that the cumulative frequency of the fourth class $(cf_4)$ is $25$ and the frequency of the fourth class $(f_4)$ is $10$,we have:$cf_3 = cf_4 - f_4$$cf_3 = 25 - 10 = 15$.Thus,the cumulative frequency of the third class is $15$.

Class	$0-5$	$6-11$	$12-17$	$18-23$	$24-29$
Frequency	$13$	$10$	$15$	$8$	$11$

Age (in years)	$10-20$	$20-30$	$30-40$	$40-50$	$50-60$	$60-70$
Number of patients	$60$	$42$	$55$	$70$	$53$	$20$

Area of land (in hectares)	$1-3$	$3-5$	$5-7$	$7-9$	$9-11$	$11-13$
Number of families	$20$	$45$	$80$	$55$	$40$	$12$

For a given frequency distribution,the cumulative frequency of the fourth class is $25$ and the frequency of the fourth class is $10$. Then,the cumulative frequency of the third class is ...............

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