In a set of 10 numbers, the mean of the first 6 is 15 and the mean of the remaining 4 is 20. The combined mean is: MCQ with Answer and Explanation

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In a set of 10 numbers, the mean of the first 6 is 15 and the mean of the remaining 4 is 20. The combined mean is:

A. 16.5

B. 17.5

C. 18

D. 17

Answer: Option D

Solution (By JKSSB Mock Tests)

Sum = 6×15 + 4×20 = 90+80=170. Combined mean = 170/10 = 17.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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The Sample Registration System (SRS) in India provides data on:

A. Agricultural production

B. Fertility and mortality indicators

C. Industrial output

D. Population census

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Correct Answer: Option B

Explanation:
SRS gives reliable annual estimates of birth rates, death rates, and infant mortality rates.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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The Maternal Mortality Ratio (MMR) in India has recently declined to around:

A. 200 per 100,000

B. 113 per 100,000 live births

C. 300 per 100,000

D. 50 per 100,000

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Correct Answer: Option B

Explanation:
As per SRS 2016-18, India's MMR was 113 per 100,000 live births.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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

A. 256

B. 2

C. 4

D. 8

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Correct Answer: Option C

Explanation:
SD = √variance = 4.

This question belongs to: Accountancy and Statistics Statistics

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