Question :
X is a random variable which takes 3 values -1,0,1 with equal probability i.e. P(x=-1) = P(X=0) = P(X=1) = 1\3
Find E(X) and Var(X)
Solution :
E(X) = 0 _{(is this correct?)}
var(X) = 0 _{(is this correct?)}
zorro wrote:Question :
X is a random variable which takes 3 values -1,0,1 with equal probability i.e. P(x=-1) = P(X=0) = P(X=1) = 1\3
Find E(X) and Var(X)
Solution :
zorro wrote:E(X) = 0 _{(is this correct?)}
zorro wrote:var(X) = 0 _{(is this correct?)}
zorro wrote:Please can u tell what is wrong
My work ........
E(X) = 0
_{1} = 0
_{2}= 2/3
^{2} = 2/3
var(X) = _{2} - ^{2} = 2/3 - 2/3 = 0
Martingale wrote:zorro wrote:Please can u tell what is wrong
My work ........
E(X) = 0
_{1} = 0
_{2}= 2/3
^{2} = 2/3
var(X) = _{2} - ^{2} = 2/3 - 2/3 = 0