Calculate the mode
$17, 13, 16, 17, 16, 21, 21, 9, 12, 17$

17

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16

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21

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13

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Solution

The correct option is B $17$
Here the frequency of $17$ is highest.
So, the mode = $17$

Suggest Corrections

Size of shoe	$4$	$5$	$6$	$7$	$8$	$9$	$10$
No. of pairs sold	$15$	$17$	$13$	$21$	$18$	$16$	$11$

$x$	$15$	$16$	$17$	$18$	$19$	$20$	$21$	$22$	$23$
$f$	$6$	$7$	$9$	$13$	$10$	$12$	$8$	$0$	$4$