$f ( x ) = \left\{ \begin{array} { c l }
\frac { 2 x } { 49 } & \text { if } 0 \leq x \leq 7 \
0 & \text { otherwise }
\end{array} \right.$ is a probability density function for a continuous random variable X. Find the variance.Round to the nearest hundredth.
A)3.26
B)2.18
C)1.09
D)2.72

Question

$f ( x ) = \left\{ \begin{array} { c l } 
\frac { 2 x } { 49 } & \text { if } 0 \leq x \leq 7 \
0 & \text { otherwise }
\end{array} \right.$ is a probability density function for a continuous random variable X. Find the variance.Round to the nearest hundredth.
A)3.26
B)2.18
C)1.09
D)2.72

Quizplus · Accepted Answer

The Answer of $f ( x ) = \left\{ \begin{array} { c l } 
\frac { 2 x } { 49 } & \text { if } 0 \leq x \leq 7 \
0 & \text { otherwise }
\end{array} \right.$ is a probability density function for a continuous random variable X. Find the variance.Round to the nearest hundredth.
A)3.26
B)2.18
C)1.09
D)2.72

f(x)={2x49 if 0≤x≤70 otherwise f ( x ) = \left\{ \begin{array} { c l } \frac { 2 x } { 49 } & \text { if } 0 \leq x \leq 7 \\0 & \text { otherwise }\end{array} \right.f(x)={492x​0​ if 0≤x≤7 otherwise ​

$f ( x ) = \left\{ \begin{array} { c l } \frac { 2 x } { 49 } & \text { if } 0 \leq x \leq 7 \\0 & \text { otherwise }\end{array} \right.$