Big Idea 3 · Topic 3.15 · Exercise 1
Read the Random Rolls
25 minutes
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Q1 · 3 points on the handout
Before GameNight picks an event with RANDOM(1, 3), a player asks, 'which event will it choose?' Explain what you CAN say for certain and what you CANNOT, using the words 'set of possible results' and 'each execution.'
Q2 · 3 points on the handout
A tester must verify that the die NEVER returns 0 or 7 - only 1 through 6. Since the die's value changes every run, printing the raw roll gives no fixed answer to check. Describe what PROPERTY the test program should print instead, and why that output is predictable.
Q3 · 2 points on the handout
ENRICHMENT: GameNight wants a random EVEN bonus of 2, 4, 6, or 8. A student writes bonus <- RANDOM(2, 8) and is surprised to see 5 appear. Explain why, and design a correct expression using RANDOM plus arithmetic.
Q4 · 0 points on the handout
Next step: you determined these possible results by hand. Now head to the Topic 3.15 page and type and run the harder versions, where the computer checks a property of each random result for you.
No graded check on this page yetNot recorded
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Hand this in the way your teacher asked for it. Topic 1.1 has its graded check today, and the rest follow.