Hey,
Note: Brother in case of any queries, just comment in box I would be very happy to assist all your queries
E[X]=1 and Var(X)=4
So,
a) E[2X-4]=2*E[X]-4=2-4=-2
b) var(X)=E[X^2]-E[X]^2
So,
E[X^2]=4-1=3
c) E[4*X^2]=4*E[X^2]=4*3=12
d) E[(2X-4)^2]=E[4X^2+16-16X]=4*E[X^2]+16-16*E[X]=4*3+16-16*1=12
Kindly revert for any queries
Thanks.
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