patty has just completed her second semester in college. She earned a grade of in her ​-hour ​course, a grade of in her ​-hour ​course, a grade of in her ​-hour ​course, and a grade of in her ​-hour course. Assuming that A equals 4​ points, B equals 3​ points, C equals 2​ points, D equals 1​ point, and F is worth no​ points, determine ​'s ​grade-point average for the semester.