3 The famous fictional detective Agatha Parrot has been called in to investigate the theft of some jewels. Each thief is known to have taken just one item of jewellery.
Agatha has invented a scoring system based on motive, opportunity and past experience. The table shows the score for each of four suspects with each of three items of jewellery. The higher the score the more likely the suspect is to have stolen that item of jewellery.
Suspect
| Pearl necklace | Ruby ring | Sapphire bracelet |
| Butler | 80 | 100 | 20 |
| Cook | 40 | 35 | 60 |
| Gardener | 60 | 45 | 30 |
| Handyman | 20 | 100 | 80 |
- Assuming that three of these four suspects are the thieves, find who is most likely to have stolen each item of jewellery for the total score to be maximised. State how each table of working was calculated. Write down the two possible solutions for who should be suspected of stealing each item of jewellery and who should be thought to be innocent.
Further evidence shows that the butler stole the sapphire bracelet.
- Using this additional information, find out which suspect should be thought to be innocent. Explain your reasoning.