10 The table shows the age structure of usual residents of 18 Local Authorities (LAs) in the North West region of the UK in 2011.
| Local Authority | Age 0 to 17 | Age 18 to 24 | Age 25 to 64 | Age 65 and over |
| A | 26.20\% | 9.06\% | 51.81\% | 12.92\% |
| B | 23.32\% | 8.99\% | 52.32\% | 15.37\% |
| C | 22.24\% | 8.96\% | 52.56\% | 16.23\% |
| D | 22.67\% | 8.10\% | 53.27\% | 15.96\% |
| E | 20.70\% | 7.77\% | 54.77\% | 16.76\% |
| F | 18.14\% | 6.51\% | 51.13\% | 24.21\% |
| G | 18.96\% | 14.20\% | 48.51\% | 18.33\% |
| H | 19.06\% | 14.79\% | 52.12\% | 14.04\% |
| I | 25.15\% | 9.04\% | 51.16\% | 14.65\% |
| J | 22.93\% | 8.81\% | 52.22\% | 16.04\% |
| K | 21.48\% | 13.98\% | 50.82\% | 13.73\% |
| L | 23.98\% | 9.20\% | 52.26\% | 14.56\% |
| M | 21.67\% | 11.19\% | 52.94\% | 14.19\% |
| N | 17.82\% | 6.01\% | 51.93\% | 24.23\% |
| O | 22.83\% | 7.30\% | 53.86\% | 16.01\% |
| P | 21.76\% | 8.28\% | 54.03\% | 15.93\% |
| Q | 21.42\% | 8.43\% | 53.90\% | 16.25\% |
| R | 18.61\% | 7.33\% | 49.35\% | 24.71\% |
\section*{Percentage of residents}
- Without reference to any other columns, explain how you would use only the columns for the age ranges 0 to 17 and 18 to 24 to decide whether an LA might be one of the following.
- An LA that includes a university
- An LA that attracts young couples to live
- An LA that attracts retired people to live
- Using your answers to part (a), identify the following.
- Four LAs that might include a university
- Three LAs that might be attractive to retired people
- Explain why your answer to part (b)(ii), based only on the columns for the age ranges 0 to 17 and 18 to 24, may not be reliable.
- The lower quartile, median and upper quartile of the percentages in the column "Age 65 and over" are \(14.56 \% , 15.99 \%\) and \(16.76 \%\) respectively.
Use this information to comment on your answers to part (b)(ii) and part (c).
In a magazine article, a councillor plans to describe a typical LA in the North West region. He wants to quote the average percentage of residents aged 65 or over.
- The mean of the percentages in the column "Age 65 and over" is \(16.90 \%\).
Use this information, and the information given in part (d), to explain whether the median or the mean better represents the data in the column "Age 65 and over".