Let X be a discrete random variable whos...

Let `X` be a discrete random variable whose probability distribution is defined as follows: `P(X=x)={k(x+1)forx=1,2,3,4 2k xforx=5,6,7 0ot h e r w i s e` , where `k` is a constant. Find (i) `k` (ii) `E(X)` (iii) standard deviation of `Xdot`

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