5.80 Passing scores Suppose you need a score of 70 out of 100 to pass an exam....

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5.80 Passing scores Suppose you need a score of 70 out of 100 to pass an exam. Let B denote the event you score at least 85 and D denote the event you pass the exam.

Assume P1B2 = 0.3 and P1D2 = 0.7.

a. Find P(B and D). When an event B is contained within an event D as here, explain why P(B and D) = P(B).

b. Find P(B or D). When an event B is contained within an event D, explain why P1B or D2 = P1D2.

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