Be careful with overall selectivity information. In some of the schools in this selectivity range which admit directly to the major, engineering majors are more selective than the overall school. In some of the other schools, students are admitted to a pre-engineering program and must compete by college GPA in a secondary admission process later to get into their majors.
Also, ACT scores alone may not give the full picture of selectivity, if some schools over or under emphasize ACT scores (or attract applicants who mainly use SAT instead).