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Find Std(X) in each case, when X is a discrete random variable with the following given...

Find Std(X) in each case, when X is a discrete random variable with the following given densities.

(i) f(x)=1/5, x=6,7,8,9,10.

(ii) f(x)=1/100f(x), x=1,2,3,⋯,100.

(iv) f(x)=0.3(0.7)^x, x=0,1.

(v) f(x)=1x/(x+1), x=1,2,

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