The statement is right. You can login as scott/tiger on oracle , you will get following result.
SQL> SELECT deptno "Departments", MAX(sal) "Tope Salaries"
2 FROM emp
3 WHERE deptno IN(10, 20, 30 )
4 GROUP BY Deptno
5 HAVING MAX(sal) > 4000;

Departments Tope Salaries
----------- -------------
10 5000