Two methods, A and B , are available for teaching a certain industrial skill. Th

Question

Two methods, A and B, are available for teaching a certain industrial skill. There is an 80% chance of successfully learning the skill if method A is used, and a 95% chance of success if method B is used. However, method Bis substantially more expensive and is therefore used only 25% of the time (method A is used the other 75% of the time). The following notations are suggested:

A—Method A is used.

B—Method B is used.

L—The skill was learned successfully.

Which of the following is the correct probability tree for this problem?

Which of the following represents the probability that a die toss will be less than four given that it is an odd number?

P(B)

P(A|B)

P(B|A)

Explanation / Answer

The third tree is the correct probability tree.

P(B|A)

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