Question

Find P(X > 2).

X 1 2 3 4
P(X) 0.30 0.40 0.15 ?

Answer 1

∑P(x)=1

Answer 2

use this to find P(4)

Answer 3

then add the probabilities of the numbers where x>2

Answer 4

thanks :)

Answer 5

what answer did you arrive at?

Answer 6

Another way i just thought of is to
say that
\[P(X>2)\]\[=1-P(X<2)\]