Twelve customers visit a small bank between $9a.m,$ and $10$:$30a.m.$ The customers spend $7,1218,16,7,11,14,19,27,22,17$ and $10$ minutes in the bank. What is the average number of customers in this bank?

Multiple Choice

$167$

$2$

$2\mathrm{.}56$

$122$