Answer
$\mu=4$
$\sigma=3.464$
Work Step by Step
Given $p=1/4=0.25$, we have $q=1-p=0.75$
Use the formula for a geometric distribution, we have
$\mu=1/p=4$
$\sigma=\sqrt {q/p^2}=\sqrt {0.75/0.25^2}=3.464$
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