If the variance of a dataset is 16, the standard deviation is: MCQ with Answer and Explanation

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If the variance of a dataset is 16, the standard deviation is:

A. 2

B. 8

C. 256

D. 4

Answer: Option D

Solution (By JKSSB Mock Tests)

SD = √variance = 4.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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The average wage of 10 male workers is Rs. 500, and of 10 female workers is Rs. 400. What is the combined mean wage?

A. 450

B. 460

C. 440

D. 900

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Correct Answer: Option A

Explanation:
Combined mean = (n1*x1 + n2*x2) / (n1+n2) = (5000 + 4000) / 20 = 450.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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The population of India as per 2011 Census is:

A. 1.4 billion

B. 1.31 billion

C. 1.02 billion

D. 1.21 billion

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Correct Answer: Option D

Explanation:
1.21 billion (1210.2 million).

This question belongs to: Accountancy and Statistics Statistics

Question #3

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A 'life table' provides estimates of:

A. Fertility rates only

B. Probability of dying at each age and life expectancy

C. Migration rates

D. Population density

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Correct Answer: Option B

Explanation:
Life tables summarize age-specific mortality and survival.

This question belongs to: Accountancy and Statistics Statistics

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