Ex $1.$ The following data represents the traffic volume counts that were made during a $2-$hour counting period. The day's peak hour flow was also observed during this time. $(20$ pts$)$

$\backslash$table$[[$Time Interval,Volume for Time Interval $($veh$)],[7$:$00-7$:$15$ AM$,225],[7$:$15-7$:$30$ AM$,216],[7$:$30-7$:$45$ AM$,226],[7$:$45-8$:$00$ AM$,224],[8$:$00-8$:$15$ AM$,222],[8$:$15-8$:$30$ AM$,227],[8$:$30-8$:$45$ AM$,225],[8$:$45-9$:$00$ AM$,228]]$

a$.$ What is the peak hour period?

b$.$ What is the peak hour volume?

c$.$ The peak flow rate within the peak hour,

d$.$ What is the peak hour factor?