The document involves a discrete random variable, x, with a moment generating function defined as mx(t) = 1 0.72 e^t + 0.28 e^t. It requests the calculation of the expected value E[9x^2]. The potential answers for this calculation are presented as numerical options.

1. Let X be a discrete random variable with moment generating function given by: M x ( t ) = 1
0.72 e t 0.28 e t . Find E [ 9 X 2 ] . 197.4490 167.8316 177.7041 187.5765 207.3214