P(x)=2x+1 x=1/2 964590-P(x)=2x+1 x=1/2
50 None of the other choices is correct 25 15Find the expected value of g(X) = e2X=3 Solution By de nition we have Ee 2X= 3 = Z 1 1 ex= f(x) dx= Z 1 0 e2x=3e x dx = Z 1 0 e x=3 dx= 3e x=3 1 0 = 3 434 Let Xbe a random variable with the following probability distribution x 2 3 5 f(x) 03 02 05 Find the standard deviation of X Solution Note the standard deviation is the squareFirst type the equation 2x3=15 Then type the @ symbol Then type x=6 Try it now 2x3=15 @ x=6 Clickable Demo Try entering 2x3=15 @ x=6 into the text box After you enter the expression, Algebra Calculator will plug x=6 in for the equation 2x3=15 2(6)3 = 15 The calculator prints "True" to let you know that the answer is right More Examples Chebyshev Polynomials Wikipedia P(x)=2x+1 x=1/2