Infant Mortality Rate (IMR) is the number of deaths of infants under age 1 per: MCQ with Answer and Explanation
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Question #1
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The combined mean of two groups is 50. If n₁=20, mean₁=45, and n₂=30, mean₂ is:
Correct Answer: Option B
Explanation:
50 = (20×45 + 30×mean₂) / 50 → 2500 = 900 + 30×mean₂ → mean₂ = 1600/30 = 53.33.
50 = (20×45 + 30×mean₂) / 50 → 2500 = 900 + 30×mean₂ → mean₂ = 1600/30 = 53.33.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
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If P(A) = 0.2 and P(B) = 0.3, and A, B are mutually exclusive, P(A∪B) is:
Correct Answer: Option B
Explanation:
For mutually exclusive events, P(A∪B) = P(A) + P(B) = 0.5.
For mutually exclusive events, P(A∪B) = P(A) + P(B) = 0.5.
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
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Given P(A)=0.5, P(B)=0.3, P(A∩B)=0.1. Are A and B independent?
Correct Answer: Option B
Explanation:
P(A)P(B)=0.5×0.3=0.15 ≠ 0.1, so not independent.
P(A)P(B)=0.5×0.3=0.15 ≠ 0.1, so not independent.
This question belongs to:
Accountancy and Statistics
Statistics
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