# statistics question

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#1
probability of A is 0.70 that john attends an event
probability of B is 0.55 that mary attend an event
probability of A and B is 0.45 is that john and mary attend the same event

what is the probability of
that either john or mary or both attend a particular event?
either john or mary but not both attend a particular social event?

thanks a lot its really urgent as i have a stats exam tommorow
0
7 years ago
#2
I've got the exam too, basically you can do it using a tree diagram but since this isn't too complex you can just multiply them D:

So:
1) either john or mary or both attend a particular event?
0.7*0.55*0.45=?
2)
either john or mary but not both attend a particular social event?
0.7*0.55=?

I think they're right hope this helps
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