Question

PLEASE HELP !!!!!!

Find P(x>1)
X 1 2 3 4
P(x) 0.3 0.40 0.15 ?

Answer 1

.20

Answer 2

You just add up all P(x) where x > 1.
There are 3 cases, P(x = 2 or x = 3 or x = 4).
Since it must add up to 1, the faster way is just to subtract P(x = 1).
So: 1 - 0.3 = 0.7