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The variance of 20 observations is 5 . If each observation is multiplied by 3 , then what is the new variance of the resulting observations? $\quad$
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Verified Answer
The correct answer is:
45
New variance $=\mathrm{k}^{2}$ (old variance) $=3^{2} \times 5$
$=9 \times 5=45$
$=9 \times 5=45$
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