Statistics - Probabilities
- Option : A
- Explanation : Ratio of A and B = 60 x 80 + 40 x 70 : 60 x 20
+40 x 30= 76 : 24
= 19: 6
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42. If A and B are mutually exclusive and
P (A ∪ B) = P (A) + P (B), then
P(A/A ∪ B) =
- Option : A
- Explanation :
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- Option : A
- Explanation :
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44. The mean of a set of number is x'. If each number is increased by λ, then mean of the new set is
- Option : B
- Explanation : "When each item is increased by λ, then mean is also increased by λ"
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- Option : A
- Explanation : P(A) = P(B') P(A) = 1 - P(B) P(A) + P(B) = 1 P(A ∪ B) - P(A ∩ B) = 1 = P(S) Hence, A ∪ B = S only if A ∩ B = φ i.e. A = B' only if A ∩ B = φ
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