A hardware store has curbside pick$-$up$,$ first implemented in $2020$ to improve sales and revenue. When a customer in their vehicle pulls up to the curb outside the store, an employee brings out the customer's order which was completed by phone or online. The "time between customers" arriving for curbside pickup can be described by an exponentially distributed continuous Random Variable $T$ with density function shown below, where $T$ is measured in units of hours.