If 'p', 'g' and 'n' are probability of success, failure and number of trials respectively in a Binomial Distribution, what is its Standard Deviation?
A. $$\sqrt {np} $$
B. $$\sqrt {pq} $$
C. $${\left( {np} \right)^2}$$
D. $$\sqrt {npq} $$
Answer: Option D
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