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Quantitative Aptitude MCQ - Probability

46 If P(A) = P(B'), then

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

47 If each observation of raw data whose variance is σ², is increased by λ, then variance of the new set is

When each item is increased by λ, the S.D. is multiplied by |λ| and variance is multiplied by λ²

48 If mode of a data is 18 and mean is 24, then median is

18 = 3 Median -2 x 24

49 If μ is mean of distribution, then Probability

Probability

Probability

50 b_yxb_xy is equal to

Probability

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Question:

Three machines M1, M2 and M3 produce identicalitems. Of their respective output 5%, 4% and 3%of items are faulty. On a certain day, M1 hasproduced 25% of the…

A. 0.155
B. 0.255
C. 0.355
D. 0.455

Correct answer: C

Explanation:

Let the event of drawing a faulty item from any of the machines be A, and the event that an item drawn at random was produced by Mi…

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