Real-Life Math -- Solution
To find the average score, begin by adding up all 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 = 315
Then
divide it by the number of students:
315 / 28 = 11.25
The
average score for this class on the test is 11.25 out of a possible 25 marks.
Now
figure out the percentage:
(11.25 x 100) / 25 = 45
The
class's average score was 45 percent. It looks like you'll have to spend a
little more time teaching these concepts.
As for how to deliver the
bad news to your class, be positive, but point out the room for improvement.
While math and science teachers use math the most, all kinds of teachers
use math skills, says math teacher Janet Munroe-Carpenter. Calculating average
grades is just one example. Another example is an English teacher calculating
the reading level of a text based on the average length of words.
"Definitely,
there's a lot of math in different subject areas," says Munroe-Carpenter.
"[For example], there's all kinds of math in music."