## Chapter 13 — Six is high and four is medium ### Lesson map Lesson 13. Map, example, EX059. ```mermaid flowchart TD S["score = likelihood * impact"] --> H{"score >= 6?"} H -->|Yes| A["high"] H -->|No| M{"score >= 4?"} M -->|Yes| B["medium"] M -->|No| C["low"] ``` The tests are `>=`. A 6 is already high. A 4 is already medium. ### Logical drawing ```text F1 6 high F3 6 high F4 4 medium F2 2 low not in this print a 5, a 3, a 9 ``` ### Learning outcomes After this chapter, you should be able to: 1. State the two thresholds. 2. Place each printed score in its band. 3. Refuse a band the file does not compute for a score it does not hold. ### 13.1 The band is computed. `medium` already fills the width. After the sort, the loop sets `score = lik * imp` again and then chooses a word. `score >= 6` yields `high`. Otherwise `score >= 4` yields `medium`. Otherwise the word is `low`. The tests are inclusive. Six is not "almost high." Four is not low. This print contains 6, 6, 4, and 2. It does not contain 5, 3, or 9. A 5 would be medium and a 3 would be low, but saying the lab printed those bands would add rows. The format `{band:6}` asks for a width of 6. `medium` is already six letters, so it receives no extra pad. `high` is four letters, so two spaces are added inside the field before the separator space. `low` is three letters, so three spaces are added. The pad is not a second score. | Score in this print | Test that matches | Word | |---:|---|---| | 6 | `>= 6` | `high` | | 4 | not `>= 6`, then `>= 4` | `medium` | | 2 | neither test | `low` | ### 13.2 Worked example | Offered claim | Threshold | Decision | |---|---|---| | "F4 is medium because 4 meets the second test." | `>= 4` after `>= 6` failed | Keep | | "High starts above 6, so F1 is medium." | 6 passes the first test | Refuse | | "The lab printed a score of 9." | No tuple multiplies to 9 | Refuse | > **Synthetic case.** Four products, three words, no extra row. ### Errors and limits Do not lower the 6 so that F1 and F3 become medium. ### Apply - **EX059 — Bands.** Which scores in this print are high, medium, and low, and what would a 5 be if it existed? *Rubric:* 3 = 6 is high, 4 is medium, 2 is low; a 5 would be medium because it fails `>= 6` and meets `>= 4`; this print has no 5;; 2 = the three printed bands are right and no extra score is claimed;; 1 = one band;; 0 = none. ### Continue studying — lesson 13 (chapter 13 of 20) [← Chapter 12](#ch-12) · [Course chapter index](../SUBJECTS.md) · [Chapter 14 →](#ch-14) Continue to the next authored lesson. ## Worked answers **EX059.** Scores 6 are high, 4 is medium, and 2 is low. A 5 would be medium. This print has no 5.