## Chapter 6 — 62.5 percent is not eight of eight ### Lesson map Lesson 06. Map, example, EX052. ```mermaid flowchart TD A["Five met checks out of eight"] --> B["Script prints 62.5 percent"] B --> C{"May the percent erase a gap line?"} C -->|No| D["Keep the percent and every gap"] C -->|Yes| E["That erasure is not this run"] ``` Equal weights in the script are not equal weights in the decision. ### Logical drawing ```text arithmetic 100 times 5 divided by 8 prints 62.5 decision one missing privileged control outweighs the percent print the percent stays the three gap lines stay ``` ### Learning outcomes After this chapter, you should be able to: 1. Explain where 62.5 percent comes from. 2. Say why that percent can mislead. 3. Refuse a note that drops a gap line to reach eight of eight. ### 6.1 The percent counts rows. It does not rank them. The script counts met rows, divides by eight, and multiplies by one hundred, showing one decimal place. Five met rows therefore print as 62.5 percent. Every row has the same weight inside that division. Elena's reading does not. Chapter 4 says all three gaps concern control over the system's rules, and that one missing control over privileged changes matters more than several minor items. A reader who keeps only 62.5 percent can describe a mostly finished setup. A reader who also keeps the gap lines sees that the unmet rows are the privileged ones: the timelock, the vendor-access review, and the monitoring of role changes and pauses. Dropping a gap line would be a different print. This file does not contain that print. The five met rows stay met, including the daily reconciliation, the backup restore, and the written incident list. Their passes do not fill the three gaps, and the percent does not either. ### 6.2 Worked example Quote the percent only together with the rows it counted. | Claim | What the arithmetic supports | Decision | |---|---|---| | "Five of eight rows are met, printed as 62.5 percent." | The embedded division | May stay | | "The three gap lines are still under that percent." | The same run | May stay | | "62.5 percent means the privileged gaps are minor." | The opposite of chapter 4 | Refuse | | "Round it to eight of eight." | A different numerator | Refuse | > **Synthetic case.** The percent belongs to this synthetic checklist. It is not a measure of the cafés' takings. ### Errors and limits A single percent hides which row failed. Here the failed rows are the ones that govern the rules. ### Apply - **EX052 — What does 62.5 authorise?** A classmate keeps the percent and deletes the gap lines, then says the setup is eight of eight. What does the percent actually record, and which lines stay? *Rubric:* 3 = 62.5 percent is five met rows out of eight; it is not eight of eight; the three gap lines stay; one missing privileged control still outweighs the percent;; 2 = keep the percent and the gaps;; 1 = the percent only;; 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.** No. 62.5 percent stays. It is not 8 of 8. One missing privileged control still outweighs the percentage.