A speaks truth in 70% cases, B in 80% cases. In what percentage of cases are they likely to contradict each other in stating the same fact? MCQ with Answer and Explanation

Question

A speaks truth in 70% cases, B in 80% cases. In what percentage of cases are they likely to contradict each other in stating the same fact?

A. 38%

B. 44%

C. 56%

D. 50%

Answer: Option A

Solution (By JKSSB Mock Tests)

Contradiction = P(A truth and B lie) + P(A lie and B truth) = 0.7×0.2 + 0.3×0.8 = 0.14+0.24=0.38=38%.

This question belongs to: Accountancy and Statistics Statistics

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Net migration rate is calculated as the difference between in-migrants and out-migrants per:

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Correct Answer: Option C

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In probability, the sample space for drawing one card from a standard deck has how many outcomes?

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Correct Answer: Option B

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The arithmetic mean of a set of values is 8. If each value is increased by 5, the new mean is:

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Correct Answer: Option C

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This question belongs to: Accountancy and Statistics Statistics

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