Consider the following probability mass function (p.m.f.) of a random variable X : p(x, q)={\\begin{array}{cc}q & \\\\text{ if }\\ X=0 \ 1-q & \\\\text{ if }\\ X=1 \ 0 & \\\\text{ otherwise }\\\\end{array}. If q = 0.4, the variance of X is___________.

GATE Civil Engineering (CE) 2015 Shift 1 Solved Paper

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Consider the following probability mass function (p.m.f.) of a random variable X:

p(x, q)={\{\table q , \;\text " if "\; X=0 ; 1-q , \;\text " if "\; X=1 ; 0 , \;\text " otherwise "\;}.

If q = 0.4, the variance of X is___________.

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