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Question 11 to 35 carry One Mark each
Q.
If the probability for A to fail in an examination is 0.2 and that for B is 0.3, then the probability that either A or B fails is
  • a)
    0.5
  • b)
    0.44
  • c)
    0.06
  • d)
    None
Correct answer is option 'B'. Can you explain this answer?
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Question 11 to 35 carry One Mark eachQ.If the probability for A to fai...
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Question 11 to 35 carry One Mark eachQ.If the probability for A to fai...
Here the event of failing is independent event
so P(A∩B) = P(A) · P(B) = (0.2)(0.3) = 0.06
the prob that either of fails is given by
P(AUB)=P(A)+P(B)-P(A∩B)
= 0.2 + 0.3 - 0.06
= 0.44
option b
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Question 11 to 35 carry One Mark eachQ.If the probability for A to fai...
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Question 11 to 35 carry One Mark eachQ.If the probability for A to fail in an examination is 0.2 and that for B is 0.3, then the probability that either A or B fails isa)0.5b)0.44c)0.06d)NoneCorrect answer is option 'B'. Can you explain this answer?
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