## Chapter 6 — Seven of eight is not a perfect eight ### Lesson map Lesson 06. Map, example, EX052. ```mermaid flowchart TD P["Published print: correct 7/8"] --> G["One genuine message was forwarded"] G --> U["Ruth treats that forward as useful"] U --> R{"Does someone change the 0 to a 1?"} R -->|Yes| N["Refuse. That would be a different list"] R -->|No| K["7/8 stays, and the forward stays useful"] ``` A kind reading does not rewrite the success count. ### Logical drawing ```text lab_route.py correct 7/8 median time 40 s over 60 s: 2 the eighth flag a genuine message, forwarded recorded as 0 in the correct list | +-- useful is not the same claim as correct +-- the 0 is not flipped +-- nobody is named ``` ### Learning outcomes After this chapter, you should be able to: 1. Keep `correct 7/8` as the published success line. 2. Keep the genuine forward as a useful report. 3. Refuse a rewritten list that would print eight of eight. ### 6.1 Useful and correct answer different questions The guided lab asked eight volunteers to report anything odd. Seven reported the suspicious message. One forwarded a genuine message instead, and Ruth treats that forward as a useful report rather than a scolding. A classmate says the kindness means the print should read eight of eight. The program counts the suspicious message only. The genuine forward is the final 0 in the correct list, which is why the line says 7/8. Calling it useful does not change that 0. Ruth does not edit `lab_route.py`, and she does not name the volunteer. ### 6.2 Worked example | Claim | Which question it answers | Decision | |---|---|---| | Seven reported the suspicious message | The correct list | Keep 7/8 | | The other forward was a useful report | Ruth's reading of that person | Keep that reading | | "So the lab was 8/8." | A different tally | Refuse | | "Change the last 0 to 1." | The published list | Refuse | > **Synthetic case.** The eighth person stays unnamed. The 0 is the list already run. ### Errors and limits Protecting the volunteer from blame does not require a prettier fraction. The fraction and the kindness can both stand. ### Apply - **EX052 — Which number moves?** Seven of eight reported the suspicious message. The other volunteer forwarded a genuine message, and Ruth calls that useful. May the print become 8/8, and what happens to the script? *Rubric:* 3 = 7/8 stays; the genuine forward stays a useful report and is not relabelled as a correct suspicious report; do not edit the script; name no volunteer;; 2 = 7/8 stays and the person is not blamed;; 1 = one of those;; 0 = none. ### Continue studying — lesson 06 (chapter 06 of 20) [← Chapter 05](#ch-05) · [Course chapter index](../SUBJECTS.md) · [Chapter 07 →](#ch-07) Continue to the next authored lesson. ## Worked answers **EX052.** 7/8 stays. The genuine forward stays a useful report and is not relabelled as a correct suspicious report. Do not edit the script. Name no volunteer.