Question

20.
If X is a normal distribution of
mean 2 and vanance 4 then
what is the variance of 2X - 1

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Answer 1

The variance of a random variable tells us something about the spread of the possible values of the variable. For a discrete random variable X, the variance of X is written as Var(X). Var(X) = E[ (X – m)2 ] where m is the expected value E(X