A 'questionnaire' is said to be reliable if it: MCQ with Answer and Explanation
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Question #1
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If P(A)=0.2 and P(B)=0.3, the minimum possible value of P(A∪B) is:
Correct Answer: Option A
Explanation:
Minimum occurs when one event is subset of the other; if B⊂A, then P(A∪B)=P(A)=0.2. But A cannot be larger than B? Actually min union is max(P(A),P(B)) = 0.3.
Minimum occurs when one event is subset of the other; if B⊂A, then P(A∪B)=P(A)=0.2. But A cannot be larger than B? Actually min union is max(P(A),P(B)) = 0.3.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
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The median of 12, 15, 11, 18, 20 is:
Correct Answer: Option D
Explanation:
Ordered: 11, 12, 15, 18, 20. Median = 15 (middle value).
Ordered: 11, 12, 15, 18, 20. Median = 15 (middle value).
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
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The weighted arithmetic mean formula is:
Correct Answer: Option B
Explanation:
Weighted mean = Σ(w_i × x_i) / Σ w_i.
Weighted mean = Σ(w_i × x_i) / Σ w_i.
This question belongs to:
Accountancy and Statistics
Statistics
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