Problem $18-6($Algo$)$

Trucks are required to pass through a weighing station so they can be checked for weight violations. Trucks arrive at the station at the

rate of $39$ an hour between $7$:$00$ p$.$m$.$ and $9$:$00$ p$.$m$.$ Currently two inspectors are on duty during those hours, each of whom can

inspect $30$ trucks an hour. Use Table $18\mathrm{.}4.$

a$.$ How many trucks would you expect to see at the weighing station, including those being inspected? $($Round your answer to $3$

decimal places.$)$

Answer is complete but not entirely correct.

b$.$If a truck was just arriving at the station, about how many minutes could the driver expect to be at the station? $($Round your answer

to $2$ decimal places.$)$

Answer is complete but not entirely correct.

$W_s,1\mathrm{.}00,$min.