Twelve customers visit a small bank between $9$ a$.$m$.$ and $10$:$30$ a$.$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?

Twelve customers visit a small bank between $9$ a$.$m$.$ and $10$:$30$ a$.$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?

$1\mathrm{.}67$

$2\mathrm{.}56$

$122$

$2$