Question

Find the missing probability?
X 1 2 3 4
P(x) 0.40 0.20 0.15 ?

Answer 1

1 2 3 and 4
are the only events, right?

Answer 2

correct
x 1 2 3 4
p(x) 0.40 0.20 0.15 ?

Answer 3

need to find 4.

Answer 4

Well, see, the thing about probabilities, when you sum up the probabilities of all possible events, the total should be 1... no more, no less
:D

So far, the probabilities for 1, 2, and 3, respectively are
0.40, 0.20, and 0.15

They add up to 0.75.

That give you an idea? :)

Answer 5

well 0.25 wil give me 100? so is that right?

Answer 6

That's right!
Great job :)


PS, 0.25 will *technically* give you 1.00, not 100 :)