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

## Question ID - 156090 :- Consider the following probability mass function (p.m.f.) of a random variable $X$ : $p(x, q)=\left\{\begin{array}{cc} q & \text { if } X=0 \\ 1-q & \text { if } X=1 \\ 0 & \text { otherwise } \end{array}\right.$ If $q=0.4$, the variance of $X$ is

3537

Answer Key : (0.23 to 0.25) -

0.23 to 0.25

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Workability of concrete can be measured using slump, compaction factor and Vebe time. Consider the following statements for workability of concrete:(i) As the slump increases, the Vebe time increases (ii) As the slump increases, the compaction factor increases Which of the following is TRUE?
(A) Both (i) and (ii) are True
(B) Both (i) and (ii) are False
(C) (i) is True and (ii) is False
(D) (i) is False and (ii) is True