Multiple choice question VII — task. Mathematics State Board, Class 10.

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If the standard deviation of

$x$ ,

$y$ ,

$z$ is

$p$ then the standard deviation of

$3x + 5$ ,

$3y + 5$ ,

$3z + 5$ is

$3p$
$9p + 15$
$3p + 5$
$p + 5$

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