The geometric mean of 1, 3, 9 is: MCQ with Answer and Explanation

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The geometric mean of 1, 3, 9 is:

A. 13

B. 3

C. 4.33

D. 3.3

Answer: Option B

Solution (By JKSSB Mock Tests)

(1×3×9)^(1/3) = 27^(1/3) = 3.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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If events A and B are independent, which of the following must be true?

A. P(A) + P(B) = 1

B. A and B are mutually exclusive

C. P(A|B) = P(A)

D. P(A ∩ B) = 0

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Correct Answer: Option C

Explanation:
Independence means knowledge of B does not affect A's probability, so P(A|B) = P(A); this is equivalent to P(A∩B)=P(A)P(B).

This question belongs to: Accountancy and Statistics Statistics

Question #2

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In a 2×2 attribute table, if (A)=400, (B)=500, N=1000, and observed (AB)=250, the expected (AB) under independence is:

A. 400

B. 300

C. 200

D. 250

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Correct Answer: Option C

Explanation:
Expected (AB) = (A)×(B)/N = 400×500/1000 = 200,000/1000 = 200. Observed 250 > 200 suggests positive association between attributes A and B.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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The main disadvantage of direct observation method is:

A. Limited to observable behavior, cannot capture attitudes

B. Low accuracy

C. High non-response

D. High cost

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Correct Answer: Option A

Explanation:
Observation only records external actions; it cannot reveal opinions, motives, or internal states.

This question belongs to: Accountancy and Statistics Statistics

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