Four mark exercise problems IV — task. Mathematics State Board, Class 8.

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In a study of dental problem, the following data were obtained.

Ages	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$	$60 - 70$	$70 - 80$
No. of patients	$5$	$13$	$25$	$14$	$30$	$35$	$43$	$50$

Represent the above data by a frequency polygon.

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14. Four mark exercise problems IV