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

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- February 18th 2013, 04:16 AMMathJackCould someone please help me with this
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 - February 19th 2013, 02:09 AMchiroRe: 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)).