Question

Solve the following :

The following probability distribution of r.v. X

X=x	-3	-2	-1	0	1	2	3
P(X=x)	0.05	0.1	0.15	0.20	0.25	0.15	0.1

Find the probability that

X is positive

Answer 1

P (X is positive) = P(X = 1) + P (X = 2) + P(X = 3)

 = 0.25 + 0.15 +0.1+ = 0.50