Find " E(2X-1)" Find the variance of X and Var(2x-1)

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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"---"----Consider the experiment of two dice are drawn. Let  X be a random variable representing the difference of the number on the face of these two dice.

Find " E(2X-1)"

Find the variance of X and Var(2x-1) 

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