In a Poisson distribution, P(X=0) = e^{-λ}. If λ=2, P(X=0) is about: MCQ with Answer and Explanation

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In a Poisson distribution, P(X=0) = e^{-λ}. If λ=2, P(X=0) is about:

A. 0.05

B. 0.2

C. 0.271

D. 0.135

Answer: Option D

Solution (By JKSSB Mock Tests)

e^{-2} ≈ 0.1353.

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Combined mean formula is essential when:

A. Calculating mode

B. All groups have the same size

C. Data is qualitative

D. Merging means from groups of different sizes

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Correct Answer: Option D

Explanation:
Combined mean = (n₁x̄₁ + n₂x̄₂) / (n₁ + n₂) weights each group's mean by its size, providing the correct overall mean when aggregating subgroup statistics.

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Total Fertility Rate (TFR) measures the average number of children a woman would bear in her lifetime if:

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B. She marries early

C. She survives through reproductive ages and experiences current age-specific fertility rates

D. She has only female children

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Correct Answer: Option C

Explanation:
TFR is a synthetic measure indicating average lifetime births per woman under current fertility schedule.

This question belongs to: Accountancy and Statistics Statistics

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The sum of absolute deviations is minimized by:

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Correct Answer: Option B

Explanation:
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This question belongs to: Accountancy and Statistics Statistics

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