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. 18

C. 17

D. 17.5

Answer: Option C

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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In Bayes' theorem, the initial probabilities before observing evidence are called:

A. Marginal probabilities

B. Posterior probabilities

C. Prior probabilities

D. Likelihoods

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Correct Answer: Option C

Explanation:
Prior probabilities represent the initial degree of belief.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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In the theory of attributes, the total number of objects N is equal to:

A. (A)+(B)-(AB)

B. Both A and B

C. (A)+(α)

D. (AB)+(Aβ)+(αB)+(αβ)

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Correct Answer: Option B

Explanation:
Both identities hold; (A)+(α)=N, and the sum of ultimate class frequencies also equals N.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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The sex ratio of India according to Census 2011 is:

A. 925

B. 943

C. 933

D. 940

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Correct Answer: Option B

Explanation:
Sex ratio was 943 females per 1000 males.

This question belongs to: Accountancy and Statistics Statistics

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