Let's say I typed out the following Visa card number:

$4888605374320198$

Is this number valid, and if not, which of the following mistakes could have been made?

This is a valid Visa card number.

The $5$ th digit from the left $(6)$ should have been a $5.$

The $6$th digit from the left $(0)$ should have been a $1.$

The $7$ th digit from the left $(5)$ should have been an $4.$

The $8$th digit from the left $(3)$ should have been a $2.$

Question $5$

$12\mathrm{.}5pts$

Consider the following partial credit card number:

$477720326789202?$

What value should the check digit be$?$ Enter a single digit.