Question

Please help me~

Use the Venn diagram to answer the question below.

In the Venn diagram below, P(A) = 0.625, and P(B) = 0.8.

What is P(A and B)?

[Image in comment section.]

Answer 1

http://i1210.photobucket.com/albums/cc409/marcopvk/TEST2.png

Answer 2

Do I just add P(A & B)?

Answer 3

It is in the diagram.

Answer 4

The intersection of A and B is the space in the middle.

Answer 5

0.5?

Answer 6

....Liv, how does 1.925 make sense?

Answer 7

Yes, I believe it is 0.5 because a probability is always less than or equal to 1.

Answer 8

It is redundant and meaningless to say that X occurs 2 times out of 1.

Answer 9

So (A and B) = 0.5

Answer 10

I think so. @KingGeorge , am I leading him correctly?

Answer 11

The probability of both A and B is given by the number that is in the intersection of A and B. So P(A and B)=.5

Answer 12

Thank you, George. You always keep me from going horribly wrong. :)

Answer 13

I try my best.

Answer 14

wait look at this:

Answer 15

P(A\(\cup\)B)=the probability that A OR B happens.
P(A\(\cap\)B)=the probability that A AND B happens

Answer 16

Thanks guys!

& for this question? For two independent events A and B, P(A or B) = 0.61, P(A) = 0.40, and P(B) = 0.35.

Find P(A and B).

Answer 17

0.61 right?

Answer 18

Livformusic just provided you with the handy dandy formula that

P(A or B)=P(A)+P(B)-P(A and B)

Rearrange for P(A and B) and solve.

Answer 19

yeah sorry KingGeorge is right. i had them switched

Answer 20

Oh okaay! 0.14 then! Thanks againg guys!

Answer 21

*again.

Answer 22

.14 is correct.