Answer: 0.248
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Work Shown:
P(A and B) = P(A)*P(B|A)
P(A and B) = 0.8*0.31
P(A and B) = 0.248
The notation P(B|A) means "Probability of B given A". It's the same as "P(B) given event A has happened". It is conditional probability notation. The symbol between the A and B is a vertical line and not a letter.
