Question $6($Mandatory$)(10$ points$)$

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"Given the following data at the drive$-$through of a bank, what is the average processing $($service$)$ time from $8$:$06$ to $8$:$36?"$

Customer

Arrival Time

Service Time $($minutes$)$

$1$

$8$:$06$

$5$

$2$

$8$:$10$

$10$

$3$

$8$:$15$

$7$

$4$

$8$:$36$

$2$

Question $6$ options:

$10$ minutes

$6$ minutes

$7\mathrm{.}5$ minutes

$8$ minutes