Solution
first five even natural numbers = 2,4,6,8,10
Mean = 6
Standard deviation = $$\sqrt{\frac{\left(\ \left(6-2\right)^2+\left(6-4\right)^2+\left(6-6\right)^2+\left(6-8\right)^2+\left(6-10\right)^2\right)}{5}}$$ = $$\sqrt{\ 8}=2\sqrt{\ 2}$$
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