Find and interpret the mean of the random variable X$.$

The mean is enter your response here $$call$($s$)$ and$$ therefore, there$$ is$/$are

$$

enter your response here

$$

call$($s$)$

reservation$($s$)$

per hour from

$$

the national office

a motel's reception desk

a motel's computer terminal

the national reservation center

to

$$

the national reservation center.

a motel's reception desk.

a motel's computer terminal.

the national office.

$($Round to three decimal places as$$ needed.$)$