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7. Three mark exercise problems III

The following are the marks obtained by

$30$ students in a class test out of

$20$ in Mathematics subject.

$11$	$12$	$13$	$12$	$12$	$15$	$16$	$17$	$18$	$12$
$20$	$13$	$13$	$14$	$14$	$14$	$15$	$15$	$15$	$15$
$16$	$16$	$16$	$15$	$14$	$13$	$12$	$11$	$19$	$17$

Answer:

Numbers	Tally marks	Frequency
$11$
$12$
$13$
$14$
$15$
$16$
$17$
$18$
$19$
$20$
Total		$30$

Answer variants:

$1$

$4$

$6$

$2$

$5$

$3$

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