10 The pre-release material contains information about the birth rate per 1000 people in different countries of the world. These countries have been classified into different regions.
The table shows some data for three of these regions: the mean and standard deviation (sd) of the birth rate per 1000, and the number of countries for which data was used, n.
\section*{Birth rate per 1000 by region}
| Africa | Europe | Oceania |
| \(n\) | 55 | 49 | 21 |
| mean | 29.3 | 10.0 | 17.8 |
| sd | 8.43 | 1.94 | 4.50 |
- Use the information in the table to compare and contrast the birth rate per 1000 in Africa with the birth rate per 1000 in Europe.
- The birth rate per 1000 in Mauritius, which is in Africa, is recorded as 9.86. Use the information in the table to show that this value is an outlier.
- Use your knowledge of the pre-release material to explain whether the value for Mauritius should be discarded.
- The pre-release material identifies 27 countries in Oceania. Suggest a reason why only 21 values were used to calculate the mean and standard deviation.