Detailed Case Study Search the Archive Feedback

1. Arrange students into groups. Each group needs at least ONE person who has a mobile device.

2. If their phone camera doesn't automatically detect and decode QR codes, ask students to

- Download a QR reader (e.g. I-Nigma | NeoReader | Kaywa) onto their mobile devices
- Bring these devices into the lesson.

4. Cut them out and place them around your class / school.

1. Give each group a clipboard and a piece of paper so they can write down the decoded questions and their answers to them.

2. Explain to the students that the codes are hidden around the school. Each team will get ONE point for each question they correctly decode and copy down onto their sheet, and a further TWO points if they can then provide the correct answer and write this down underneath the question.

3. Away they go! The winner is the first team to return with the most correct answers in the time available. This could be within a lesson, or during a lunchbreak, or even over several days!

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

## Question | ## Answer |

1. The relative frequency of someone being a vegetarian is 0.2. If I ask 200 people, how many would I expect to be vegetarian? | 40 |

2. The relative frequency of someone liking Nandos is 75/100. If I ask 500 people, how many would I expect to like Nandos? | 375 |

3. I roll a dice 600 times. I roll a six 200 times. Is this dice fair? Explain your answer. | No because you would expect to roll a six 100 times. |

4. The probability of Leicester winning the league is 0.7. The probability of Chelsea winning the league is 0.05. What is the probability of Leicester or Chelsea winning the league? | 0.75 |

5. Drawer A contains 7 red socks and 3 black socks.Drawer B contains 4 red socks and 6 black socks.A sock is taken from each drawer.What is the probability of picking a red sock from each drawer? | 0.28 |

6. The probability that Tom is late for school is 0.7. What is the probability that he is on time for school? | 0.3 |

7. What does the notation P(A U B) mean? | The probability of A or B. |

8. What does the notation P(A') mean? | The probability of A not happening. |

9. Which part of a venn diagram matches the notation P(A ∩ B)? | The intersection. |

10. I roll 2 fair dice. What is the probability that I roll two 6's? | 1/36 |

11. 50 people take part in a survey which asks about their favourite TV programme. 23 of them are girls. 6 girls prefer soap operas. What is the probability of me picking a student who prefers soap operas given that they are female? | 6/23 |

12. There are 7 pink marbles and 2 green marbles in a bag. I take 2 marbles from the bag, one at a time, without replacing them.What is the probability of me picking 2 pink marbles? | 42/72 |

13. If 150 students were asked whether they preferred milk or white chocolate and 20 students preferred white chocolate, how many preferred milk chocolate? What is the relative frequency of a student preferring white chocolate? | 130 and 0.13. |

14. There are 2 red balls and 8 blue balls in a bag. I take 2 balls from the bag, one at a time, and don't replace them. What is the probability of me picking at least 1 red ball? | 34/90 |

15. I flip a coin 10 times but only get 1 tail. Explain why this coin isn't necessarily biased. | Because the coin was only flipped 10 times and the more flips the more accurate the probability. |

16. The probability of Josh remembering his exercise book is 0.2. What is the probability that he forgets his exercise book? | 0.8 |

17. The relative frequency of someone having an iPhone is 0.65. If I ask 500 people, how many would I expect to have an iPhone? | 325 |

18. I ask 50 people if they support Arsenal and 25 say yes, giving a relative frequency of 0.5. I ask 200 people the same question and 175 people say yes, giving a relative frequency of 0.875. Which is more accurate and why? | 0.875 because more people were asked. |

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