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

2. ## Re: Could someone please help me with this

Hey MathJack.

Hint: Calculate E[Y^2] and E[Y]^2 and remember that SD(Y) = SQRT(Var(Y)).