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The probability that a candidate can pass in an exam is 0.6i)What is the probability that he pass in the third trial?ii)What is the probabil

Home/Math/The probability that a candidate can pass in an exam is 0.6i)What is the probability that he pass in the third trial?ii)What is the probabil

The probability that a candidate can pass in an exam is 0.6i)What is the probability that he pass in the third trial?ii)What is the probabil

Question

The probability that a candidate can pass in an exam is 0.6i)What is the probability that he pass in the third trial?ii)What is the probability that he pass before the third trial.

## Answers ( )

14

45

Explanation:

P(A or B) = P(A) + P(B) – P(A and B)

Take

A = Mr x passes Mathematics

B = Mr x passes Statistics

Then we have

P(A or B) = 4/5 = 2/3 + 4/9 – P(A and B)

⇒

P(A and B) = 2/3 + 4/9 – 4/5

=

30

+

20

−

36

45

=

14

45