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In a Poisson distribution with mean 5, standard deviation equals
A√5
B5
C25
D2.5
Answer & Solution
Correct answer: A. √5
1. For Poisson(λ): variance = λ.
2. Standard deviation = √variance = √λ = √5.
3. Numerically √5 ≈ 2.236.
4. Hence (B) is correct.
_Source: Maharashtra Balbharati Std XII Mathematics & Statistics (Commerce), Ch 8 "Probability Distributions", §8.2 ¶§8.2_
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