A frustrating PL/SQL Error...PLS-00103 - sql

Question

I have been learning PL/SQL for one of my classes and I am having a difficult time debugging the PLS-00103 error. I have searched the error online, but the solutions I have found aren't necessarily specific enough to solve my problem. Maybe I just need a few more eyes on this. Below you will find my code and the corresponding error message. Thank you in advance! The sample output is below the error.
Code:
create or replace procedure pro_AvgGrade as
min_avg NUMBER := 100;
max_avg NUMBER := 0;
bins NUMBER := 0;
binlen NUMBER := 10;
temp NUMBER := 0;
binprint NUMBER := 0;
CURSOR grades IS SELECT AvgGrade FROM (SELECT DeptName, AVG(GradeAsPercentage) AS AvgGrade FROM Department JOIN Course on Department.DeptId = Course.DeptId JOIN Offering on Course.CourseId = Offering.CourseId JOIN Registration on Offering.OfferingId = Registration.OfferingId GROUP BY DeptName ORDER BY DeptName ASC);
grade_tuple grades%ROWTYPE;
BEGIN
open grades;
for grade_tuple in grades loop
temp := grade_tuple.AvgGrade;
if (temp>max) then
max_avg := temp;
elsif (temp<min) then
min_avg := temp;
end if;
end loop;
close grades;
binprint := min_avg;
bins := max_avg-min_avg;
bins := bins/binlen;
dbms_output.put_line('DeptName AvgGrade: ');
LOOP
dbms_output.put('>' || min_avg || ',' || '<=');
min_avg := binlen+10;
dbms_output.put(min_avg);
dbms_output.put(' ');
i := i+1;
EXIT WHEN i>bins;
END LOOP;
END pro_AvgGrade;
/
begin
pro_AvgGrade;
end;
/
Error:
LINE/COL ERROR
-------- -----------------------------------------------------------------
19/15 PLS-00103: Encountered the symbol ")" when expecting one of the
following:
(
21/18 PLS-00103: Encountered the symbol ")" when expecting one of the
following:
(
Sample Output:
DEPTNAME AVGGRADE: >70, <=80 >80,<=90

Answer 1

May be it's because max and min are reserved words...so it looking for max() and min()...
But it looks more that you just made a mistake. I think you need to try this :
if (temp>max_avg) then
max_avg := temp;
elsif (temp<min_avg) then
min_avg := temp;
end if;

Answer 2

There is no need for parenthesis in your if block. Write it like this:
if temp>max then
max_avg := temp;
elsif temp<min then
min_avg := temp;
end if;