At bus stop A on a conventional transit route, the passenger arrivals arc random during $7$:$00$ am ~ $9$:$00$ am$.$ The mean passenger arrival rates arc $120$ passengers per hour during $7$:$00$ am ~ $8$:$00$ am and $60$ passengers per hour during $8$:$00$ am ~ $9$:$00$ am$.$ The scheduled and actual bus arrival times arc shown in Table $1.(5\%)$ The average waiting time based on the scheduled bus arrival times.$(10\%)$ The average waiting time based on the actual bus arrival times.$(10\%)$ The estimated wait time based on the Welding's formula.