If two events A and B are independent, the probability that both occur is 0.2 and P(A)=0.5, then P(B) is: MCQ with Answer and Explanation

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If two events A and B are independent, the probability that both occur is 0.2 and P(A)=0.5, then P(B) is:

A. 0.4

B. 0.1

C. 0.5

D. 0.7

Answer: Option A

Solution (By JKSSB Mock Tests)

P(A)P(B)=0.2 => 0.5×P(B)=0.2 => P(B)=0.4.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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The crude death rate of a population is 7 per 1000 and the population is 10 million. The estimated number of deaths in a year is:

A. 700

B. 7,000

C. 70,000

D. 700,000

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Correct Answer: Option C

Explanation:
Deaths = (7/1000) × 10,000,000 = 70,000.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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The Harmonic Mean of 2 and 4 is:

A. 3

B. 2.67

C. 2.83

D. 3.5

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Correct Answer: Option B

Explanation:
HM = 2ab / (a+b) = 2(2)(4) / (2+4) = 16/6 = 2.67.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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Which of the following mortality measures uses a standard population?

A. Infant Mortality Rate

B. Standardized Death Rate

C. Crude Death Rate

D. Age-specific Death Rate

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Correct Answer: Option B

Explanation:
Standardized death rate applies age-specific rates to a standard age distribution.

This question belongs to: Accountancy and Statistics Statistics

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