The probability mass function of the discrete random variable X is given by the following table
X -1 0 1/2 1
PX(x) 1/8 1/8 1/4 1/2
Q: Let Y = X^2, calculate the standard deviation of Y
Follow Math Help Forum on Facebook and Google+
Hint: Calculate E[Y^2] and E[Y]^2 and remember that SD(Y) = SQRT(Var(Y)).