NEED HELP WITH $2$ AND $3$ PLS$.$

Consider a cash$-$only toll booth at San Francisco Bay Bridge.

On average, every $15$ seconds a car arrives at the toll booth, i$.$e$.,$

the average inter$-$arrival time is $15$ seconds.

The toll service takes on average $9$ seconds, i$.$e$.,$ the average

processing time is $9$ seconds.

The coefficient of variation of the inter$-$arrival time CVa is $1\mathrm{.}5.$

The coefficient of variation of the processing time CVp is $1.$

Please use the information provided above to do the three

calculations below:

$\%$ of the time the clerk works at the toll

booth is busy. $($Report the answer without the $\%$ sign. For example,

if you answer is $90\%,$ report $90.)$

The average amount of time a car spends waiting in line is

seconds. $($Round your answer to the first

decimal place$)$

On average,

cars are waiting in line. $($Round

your answer to the first decimal place$)$