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During a pandemic, 10% of the patients who have the disease get complications. If 100 patients of a locality get intected by the disease, then the standard deviation of the number of patient getting complications is:

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answer is D.

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Detailed Solution

$\begin{array}{l} n = 100 \\ p = \frac{1}{10} \\ q = \frac{9}{10} \\ σ = \sqrt{npq} \\ = \sqrt{100 \times \frac{1}{10} \times \frac{9}{10}} \\ = 3 \end{array}$

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