Question

For a discrete random variable X, whose probability distribution is defined as :
$P(x)=\begin{cases} 2k(x+1) ;& x = 0,1 \\\ 3kx; & x=2 \\\ k(5-x) & x=3 \end{cases}$
The value of mean will be

• A. $\frac{6}{7}$
• B. $\frac{15}{7}$
• C. $\frac{12}{7}$
• D. $\frac{11}{7}$

Answer 1

Answer: (D)

$\frac{11}{7}$

Answer 2

The correct option is (D) :$\frac{11}{7}$.