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Question #1
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If P(A)=0.6, P(B)=0.5, and P(A∩B)=0.3, then P(A'|B) is:
Correct Answer: Option B
Explanation:
P(A'|B) = 1 - P(A|B). P(A|B) = 0.3/0.5 = 0.6. So P(A'|B)=0.4.
P(A'|B) = 1 - P(A|B). P(A|B) = 0.3/0.5 = 0.6. So P(A'|B)=0.4.
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Accountancy and Statistics
Statistics
Question #2
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Assertion (A): The crude death rate of a developed country may be higher than that of a developing country. Reason (R): Developed countries often have an older age structure. Choose the correct option:
Correct Answer: Option A
Explanation:
CDR can be higher in developed countries due to larger elderly population, despite lower age-specific mortality. R explains A.
CDR can be higher in developed countries due to larger elderly population, despite lower age-specific mortality. R explains A.
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
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The arithmetic mean of 5 numbers is 20. If one number is excluded, the mean of the remaining 4 numbers becomes 18. The excluded number is:
Correct Answer: Option A
Explanation:
Sum of 5 numbers = 5 × 20 = 100. Sum of 4 numbers = 4 × 18 = 72. Excluded number = 100 - 72 = 28.
Sum of 5 numbers = 5 × 20 = 100. Sum of 4 numbers = 4 × 18 = 72. Excluded number = 100 - 72 = 28.
This question belongs to:
Accountancy and Statistics
Statistics
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