Q.30 let x=(x,, x,) have joint probability density function ifo<| s, c fg,x,)=27 0 otherwise then the variance of random variable x, is c) (d) a) b)

Q.30 Let X=(X,, X,) have joint probability density function ifo<| s, c fG,x,)=27 0 otherwise Then the variance of random variable X, is C) (D) A) B)