Which of the following is NOT a recommended practice for ordering questions in a questionnaire? MCQ with Answer and Explanation
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Question #1
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If the probability of a student passing an exam is 0.8 and the probability of another student passing is 0.7, and these events are independent, the probability that at least one passes is:
Correct Answer: Option C
Explanation:
P(at least one) = 1 - P(both fail) = 1 - (0.2×0.3) = 1 - 0.06 = 0.94.
P(at least one) = 1 - P(both fail) = 1 - (0.2×0.3) = 1 - 0.06 = 0.94.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
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WPI basket does not include:
Correct Answer: Option C
Explanation:
WPI covers goods only; services are excluded.
WPI covers goods only; services are excluded.
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
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If P(A) = 0.3, P(B) = 0.4, and A and B are independent, P(A ∪ B) is:
Correct Answer: Option A
Explanation:
For independent events, P(A∩B)=P(A)P(B)=0.3×0.4=0.12. Then P(A∪B)=P(A)+P(B)-P(A∩B)=0.3+0.4-0.12=0.58, applying the addition theorem with the independence condition.
For independent events, P(A∩B)=P(A)P(B)=0.3×0.4=0.12. Then P(A∪B)=P(A)+P(B)-P(A∩B)=0.3+0.4-0.12=0.58, applying the addition theorem with the independence condition.
This question belongs to:
Accountancy and Statistics
Statistics
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