Quantitative Aptitude - Probability
- 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
- Option : B
- Explanation : When each item is increased by λ, the S.D. is multiplied by |λ| and variance is multiplied by λ2
49. If μ is mean of distribution, then 
is equal to
