∑ DANEMATHICS
FREE CAPS MATHS RESOURCES
Grade 8–9 · Probability
Probability: The Complete Grade 8–9 Guide
MEMORANDUM
Name:
Class:
Date:
Mark
/ 20
Answer all questions. Show all your working — marks are awarded for method as well as the final answer. Teacher copy: accept any correct equivalent method.
- 1A bag has 3 red and 5 blue balls. P(red)? (single)(2)3⁄8✓✓ (2)
- 2P(rolling a number greater than 4 on a die)? (single)(2)5, 6 → 2⁄6 = 13✓✓ (2)
- 3A bag has 2 red, 3 blue, 5 yellow. P(yellow)? (single)(2)5⁄10 = 12✓✓ (2)
- 4If P(win) = 0,35, find P(not win). (complement)(2)1 − 0,35 = 0,65✓✓ (2)
- 5P(not rolling a 6 on a die)? (complement)(2)1 − 1⁄6 = 5⁄6✓✓ (2)
- 6A spinner is 4 equal colours. P(not green)? (complement)(2)1 − 14 = 34✓✓ (2)
- 7A die is rolled 60 times; a 3 comes up 12 times. Relative frequency? (rel. freq.)(2)12⁄60 = 0,2✓✓ (2)
- 8Two coins are tossed. P(one head and one tail)? (two events)(2)HT or TH → 2⁄4 = 12✓✓ (2)
- 9Two coins are tossed. P(no heads)? (two events)(2)Only TT → 14✓✓ (2)
- 10P(drawing a vowel) from the letters of MATHS? (single)(2)Only A → 1⁄5✓✓ (2)
TOTAL: 20 marks