A box contains 4 white and 2 black balls. Two balls are drawn successively with replacement. Probability both are white is: MCQ with Answer and Explanation

Question

A box contains 4 white and 2 black balls. Two balls are drawn successively with replacement. Probability both are white is:

A. 4/9

B. 1/9

C. 2/3

D. 5/9

Answer: Option A

Solution (By JKSSB Mock Tests)

With replacement: P(WW) = (4/6)×(4/6) = 16/36 = 4/9.

This question belongs to: Accountancy and Statistics Statistics

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If a researcher wants to study the association between smoking and lung cancer using a 2×2 table, which coefficient can be used?

A. Fisher's ideal index

B. Time reversal test

C. Yule's Q

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Correct Answer: Option C

Explanation:
Yule's Q measures association between two attributes.

This question belongs to: Accountancy and Statistics Statistics

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The class midpoint is also known as:

A. Class mark

B. Class frequency

C. Class limit

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Correct Answer: Option A

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Class mark = (lower limit + upper limit)/2.

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Question #3

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Wholesale Price Index (WPI) is more sensitive to changes in:

A. Imported luxury goods

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C. Service sector prices

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Correct Answer: Option B

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