Determine Whether the Function Is a Probability Density Function Over $$\mathrm { f } ( \mathrm { x } ) = \frac { 1 } { 3 } \mathrm { x } , 6 \leq \mathrm { x } \leq 8$$

True/False

Determine whether the function is a probability density function over the given interval.
- $$\mathrm { f } ( \mathrm { x } ) = \frac { 1 } { 3 } \mathrm { x } , 6 \leq \mathrm { x } \leq 8$$