Find the expected value
Let the random variable X of the discrete type have the pdf given by the table
X 1 | 2 | 3 | 4
p(x) .4 | .1 | .3 | .2
A) Find the expected value of 2x^2 + 5x + 2 and the variance of 3X
B) Find the expected value of 2^x and variance of 3X^2
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