Question

If event's A and B are independent and P(A)= .3 and P(B)= .5, then which of the following is true?
A. P(A and B)= .8
B. P(A or B)= .15
C. P(A or B)= .8
D. P(A/B)= .3
E. P(A/B)= .5

Answer 1

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

we know that they are independent so
P(A and B) = 0

->

P(A or B) = P(A) + P(B)
can you answer now ?

Answer 2

uhmmmmm...i think so.

Answer 3

.8?

Answer 4

Wait, no. That's not it. Because my teacher gave us one answer that isn't right and that's A.
So it can't be A.

Answer 5

C. P(A or B)= .8

Answer 6

my equation stands for P(A or B) you looked at P(A and B) in a.

Answer 7

ahhhhh, kay. thanks(:

Answer 8

is there only one answer ?

Answer 9

yeah, just one.