In a Poisson distribution, the probability of zero successes is e^{-λ}. If λ=3, this probability is approximately: MCQ with Answer and Explanation

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In a Poisson distribution, the probability of zero successes is e^{-λ}. If λ=3, this probability is approximately:

A. 0.10

B. 0.20

C. 0.15

D. 0.05

Answer: Option D

Solution (By JKSSB Mock Tests)

e^{-3} ≈ 0.0498 ≈ 0.05.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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The base year of the current series of CPI-IW (2016 series) is:

A. 2012

B. 2016

C. 2001

D. 2010

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Correct Answer: Option B

Explanation:
The current CPI-IW series has base year 2016, replacing the 2001 series.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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In a normal distribution, approximately what percentage of data falls within Mean ± 1 Standard Deviation?

A. 95.45%

B. 50%

C. 99.73%

D. 68.27%

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Correct Answer: Option D

Explanation:
According to the empirical rule for normal distributions, roughly 68.27% of observations lie within one standard deviation of the mean.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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When rolling a fair die, the probability of getting a number greater than 4 is:

A. 1/2

B. 1/6

C. 2/3

D. 1/3

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Correct Answer: Option D

Explanation:
Numbers >4 are 5,6 → 2 out of 6 → probability = 1/3.

This question belongs to: Accountancy and Statistics Statistics

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