PA $2-5($Static$)$ Based on the data provided in Table $2\mathrm{.}5,...$

Based on the data provided in Table $2\mathrm{.}5,$ what is the flow time of callers from $8$:$00$ a$.$m$.$ to $8$:$20$ a$.$m$.?$

Note: Round your answer to $1$ decimal place.

Caller Time in Time out

$18$:$018$:$05$

$28$:$028$:$07$

$38$:$068$:$08$

$48$:$098$:$12$

$58$:$108$:$15$

$68$:$128$:$20$

$78$:$168$:$19$

$88$:$178$:$19$