Question 1:
First, if I'm printing a string and the value of a calculation of 2 variables, as in:

print "The average is $total/$count";

...how can I do it so that the value of the calculation shows up?? Right now I'm getting something like:

The average is 60/9

Just take the calculation out of the quoted string.

print "The average is ", $total/$count;

Do I have to use PRINTF??? In fact, while we're on this subject, how can I format the value so that it only has two decimal places?

That you can do with printf.

printf "The average is %.2f", $total/$count;

Question 2:
What are these NEXT, UNLESS and LAST statements? In my whooping 1 week of PERL, I haven't yet come across these statements. I'd like to learn. Can you suggest a good place for looking up PERL syntax/statements?

Type perldoc perltoc at your command line to see the table of contents for the Perl documentation. For the loop control statements, see the "Loop control" section in perldoc perlsyn.