The notation (αβ) indicates items that: MCQ with Answer and Explanation

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The notation (αβ) indicates items that:

A. Possess B but not A

B. Possess A but not B

C. Possess neither A nor B

D. Possess both A and B

Answer: Option C

Solution (By JKSSB Mock Tests)

α is not A, β is not B, so (αβ) = items without A and without B.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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A car travels 60 km/h for the first half of a distance and 40 km/h for the second half. The average speed (km/h) is:

A. 52

B. 50

C. 48

D. 45

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Correct Answer: Option C

Explanation:
Harmonic mean of speeds: 2 / (1/60 + 1/40) = 2 / (5/120) = 240/5 = 48 km/h.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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The harmonic mean of the numbers 3, 6, 9 is:

A. 18/11

B. 54/11

C. 11/54

D. 6

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Correct Answer: Option B

Explanation:
HM = 3 / (1/3 + 1/6 + 1/9) = 3 / ( (6+3+2)/18 ) = 3 / (11/18) = 54/11 ≈ 4.909.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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In the theory of attributes, the total number of ultimate class frequencies for 'n' attributes is:

A. 3^n

B. n^2

C. n!

D. 2^n

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Correct Answer: Option D

Explanation:
For n attributes, each can be either present or absent, resulting in 2^n ultimate class frequencies.

This question belongs to: Accountancy and Statistics Statistics

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