Q28
A random variable X has a probability density function, \[ f ( x ) = \ array*20c k x^ n e^ - x;& x 0 \\ 0;& otherwise array .\] (n is an integer) with mean 3. The values of k, n are
A random variable X has a probability density function, {\text{f}}\left( {\text{x}} \right) = \left\{ {\begin{array}{*{20}{c}}
{{\text{k}}{{\text{x}}^{\text{n}}}{{\text{e}}^{ - {\text{x}}}};}&{{\text{x}} \geqslant {\text{0}}} \\
{0;}&{{\text{otherwise}}}
\end{array}} \right. (n is an integer) with mean 3. The values of {k, n} are
A.
B.
C.
Answer
D.
Answer: Option C
Solution
Answer: Option C
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