SOLUTION: (a) 70% students are prepared and the others are not prepared for an examination. Those who are prepared have 90% chance of success, while those who are not prepared will have a

Question 932148: (a) 70% students are prepared and the others are not prepared for an examination.
Those who are prepared have 90% chance of success, while those who are not
prepared will have a probability of success of 20% in the examination.
(i) What is the probability that a randomly selected student
(1) is not prepared for the examination and fails.
(2) succeeds in the examination.
(3) who has succeeded was not prepared for the examination.
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi

p   Success

.70   .90

.30   .20

.......

1) P = .30(.80)

2) P = .70(.90) + .30(.20)

3) P =  .30(.20) 

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