If the arithmetic mean of 8, 12, x, 6, 9 is 8, then x is: MCQ with Answer and Explanation

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If the arithmetic mean of 8, 12, x, 6, 9 is 8, then x is:

A. 8

B. 4

C. 5

D. 7

Answer: Option C

Solution (By JKSSB Mock Tests)

(8+12+x+6+9)/5 = 8 → 35 + x = 40 → x = 5.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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If the current WPI is 140 and base year WPI is 100, the inflation rate is:

A. 140%

B. 28.6%

C. 100%

D. 40%

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Correct Answer: Option D

Explanation:
Inflation rate = (140 - 100)/100 × 100% = 40%.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Assertion (A): In any probability distribution, P(A) + P(A') = 1. Reason (R): A and A' are mutually exclusive and exhaustive events. Choose the correct option:

A. A is false, R is true

B. A is true, R is false

C. Both A and R are true, but R is not the correct explanation of A

D. Both A and R are true, and R is the correct explanation of A

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Correct Answer: Option D

Explanation:
Complementary events partition the sample space, so their probabilities sum to 1. R correctly explains A.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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The Paasche index is likely to understate price rise because:

A. It uses geometric mean

B. It is unweighted

C. It uses current year quantities, reflecting substitution

D. It uses base year quantities

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Correct Answer: Option C

Explanation:
Substitution away from goods whose prices rose relatively reduces their weight, leading to underestimation.

This question belongs to: Accountancy and Statistics Statistics

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