Question

P(0<X≤2) =

X	-1	0	1	2
P(X)	0.4	0.1	0.2	k

• A. 0.3
• B. 0.5
• C. 0.7
• D. 0.6

Answer 1

Answer:

B. 0.5

P(0<X≤2) = P(X=1) + P(X=2)

$P(X=1) = 0.2$

$P(X=2)=k$

$ΣP(X) = 1$

0.4+0.2+0.1+k = 1 = > 0.7 + k =1

$k=0.3$

P(0<X≤2) = 0.2 +k = 0.2 + 0.3 = 0.5