Five customers arrive at a small post office between $10$:$00$ a$.$m$.$ and $10$:$30$ a$.$m$.$ Given the following arrival and processing data, what is the average processing time during this timeframe?

$\backslash$table$[[$Customer$,$Arrival Time,$\backslash$table$[[$Service Time$],[($minutes$)]]],[1,10$:$00,4],[2,10$:$08,7],[3,10$:$14,6],[4,10$:$23,3],[5,10$:$30,5]]$

Multiple Choice

$3$ minutes

$7$ minutes

$5$ minutes

$25$ minutes