Answer :

Given that, Radom variable X is the member of tails in three tosses of a coin

So, X= 0,1,2,3

Where n=3, and x= 0,1,2,3

We know that, Var (X)= E(X2)- [E(X)]2 ……(i)

Where, E(X2) =



Putting the values of E(X)2 and [E(X)]2 in equation (i), we get:

And standard deviation of

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