$f ( x ) = \left\{ \begin{array} { l r } \frac { 1 } { 7 } & \text { for } 0 \leq x \leq 7 \\0 & \text { otherwise }\end{array} \right.$

Multiple Choice

$f ( x ) = \left\{ \begin{array} { l r } \frac { 1 } { 7 } & \text { for } 0 \leq x \leq 7 \\0 & \text { otherwise }\end{array} \right.$ is a probability density function for a particular random variable X. Use integration to find $P ( 0 \leq x \leq 3 )$ rounded to the nearest hundredth.

A) 0.15
B) 0.57
C) 0.43
D) 0.28