Real-Life Math
You're a high school teacher and you've just given your class an important math quiz. Lately, your students seem to be having trouble with the concepts you're teaching. You're using this quiz to determine whether you'll have to spend more time in this area.
The test had a total of 25 marks. Here are the scores:
18, 12, 11, 5, 19, 13, 7,
5, 22, 9, 13, 14, 5, 11,
13, 8, 9, 12, 10, 13, 12,
11, 15, 4, 10, 9, 15, 10.
If there are 28 students in your class, what is the average score on this test? Try to figure out what percentage this score represents.