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G and H are mutually exclusive events. P(A)= 0.5; P(B)=0.3 Explain why this statement must be false: P(B I A)=0.4

Probability
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If two events are mutually exclusive, then the probability of one event does NOT depend on the other occurring (or not occurring). ie P(B I A)=P(B) and P(A | B)=P(A)
why must the following statement be false then?
Have a look at the probability values they gave you. P(B I A)=0.4 and P(B)=0.3 Now compare them to this... P(B I A)=P(B) which is true for mutually exclusive events.

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Ah, I see that now! Thank you.
You're welcome :)

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