Question

find the indicated probablity if p(a and b)=0.5 p(a)=0.7 and p(b)=0.5 find p(a or b)

Answer 1

If p(a)=.7, then p=.7/a
if p(b)=.5, then p=.5/a

right so far?

Answer 2

yes

Answer 3

so you need to find p of a&b? so p(ab)?

Answer 4

it only says p( a or b)

Answer 5

are you sure p(a and b) = 0.5

Answer 6

yeah that's what it says if P(a and B)=0.5

Answer 7

do you have the answer? is it 0.7?

Answer 8

I am trying to figure it out still

Answer 9

I think for 'or' you add the probibility

Answer 10

would it be 0.7?

Answer 11

i think so

Answer 12

.5/a+.7/b then?

So p=.5/a and p=.7/b

Would that be the final answer? Trying to understand this one too.

Answer 13

if A = .5 and if B = .7
and P(A and B) = .5
that means A overlaps completely over B

P(A or B) = P(A) + P(B) + P(A and B) = 0.7

Answer 14

M is correct

Answer 15

Ignore my answer then, not bad for a first shot at a probability problem though ;)

Answer 16

wait typo should be a "-"
P(A or B) = P(A) + P(B) - P(A and B) = 0.7

Answer 17

last equation i wrote is wrong sorry

Answer 18

Ok I have a new single die one if u guys wanna look at it