\text { A random variable } X \text { has pdf } f_{x}(x)=\left\{\begin{array}{cc}

c|x| & -1 \leq x \leq 1 \\

0 & e l s e

\end{array}\right. (a)Find cO (b)Find E[X]. \text { Find the probability that } X^{2} \geq \frac{1}{2} \text {. } \text { Find } E\left[3 X^{2}+4 X+2\right]