11.2 Comparing different quantities(MATH)

You will often need to compare groups that are different sizes. 

Suppose that, in one school, 85 students took an exam and 59 passed. 

In other school,237 students took an exam and 147 passed. 

Which school did better? It is hard to say because each school had a different number of students. 

The worked example shows how to use percentages to help to answer questions like this.

Work this out: 

• There are 425 girls and 381 boys in a school. 31 girls and 48 boys are overweight.

          a. work out the percentage of the girls that are overweight.

          b. work out the percentage of the boys that are overweight.

• This table shows the result of a survey in a factory.

         a. What percentage of men smokers?

         b. Compare the percentage of men and women who are                  non-smoker.

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