If you weren't given them, you'll have to look them up.

simple example to show why you have to do this.

Suppose country A has 1000 people and 100 are unemployed. That's 10% unemployed.

Suppose country B has 10 people and 9 are unemployed. That's 90% unemployed.

If you just do (10 + 90)/2 = 50, you've given too much importance to country B

You need to go back to the raw data.

Total population = 1000 + 10 = 1010

Total unemployed = 109.

So true average = 109/1010 x 100 = 10.8%

The answer is properly weighted towards the larger population.

Using the formula {(1000 x 10) + (10 x 90)} / 1010 = 10.8

Bob

]]>other than that it's just the country names which I left out

]]>That is the entire question? You are sure you have not left anything out?

]]>btw thanks guys for your time

]]>There must be another column for weights, by default we take weight to be 1 for each country.

We get 104.2 / 14 = 7.44285714286

]]>You will need them to get 8.2

]]>The unemployment rate of the 14 countries are the following:

4.0

7.2

6.8

6.6

8.3

7.8

7.8

9.6

6.7

5.1

3.9

7.8

7.8

14.8

Weighted Average is 8.2%

How did they get this 8.2??

Maybe I need to know more about the problem

]]>Weighted really just means multiplying the data by constants. What are you taking an average of? Do you have some data?

]]>