Year 9 Probability Worksheet — Level 1 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 9 probability worksheet.
Success TutoringWorksheetsAnswer sheetYear 9 · Mathematics · ProbabilityYear 9 Probability Worksheet — Level 1 — Practice Set 3 — Answers
Write each probability as a fraction in simplest form.
1.A bag has 3 red, 3 blue and 1 green marbles. One is chosen at random. What is the probability it is green?
Answer:
- Total marbles: 7
- P(green) = 1/7 =
2.A fair six-sided die is rolled. What is the probability of rolling a prime number?
Answer:
- Favourable outcomes: 3 out of 6
3.A fair six-sided die is rolled. What is the probability of rolling a multiple of 3?
Answer:
- Favourable outcomes: 2 out of 6
4.A bag has 2 red, 2 blue and 6 green marbles. One is chosen at random. What is the probability it is green?
Answer:
- Total marbles: 10
- P(green) = 6/10 =
5.A bag has 3 red, 1 blue and 1 green marbles. One is chosen at random. What is the probability it is red?
Answer:
- Total marbles: 5
- P(red) = 3/5 =
6.A bag has 3 red, 4 blue and 4 green marbles. One is chosen at random. What is the probability it is blue?
Answer:
- Total marbles: 11
- P(blue) = 4/11 =
7.A bag has 6 red, 1 blue and 6 green marbles. One is chosen at random. What is the probability it is blue?
Answer:
- Total marbles: 13
- P(blue) = 1/13 =
8.A bag has 5 red, 2 blue and 4 green marbles. One is chosen at random. What is the probability it is red?
Answer:
- Total marbles: 11
- P(red) = 5/11 =
9.A bag has 6 red, 4 blue and 2 green marbles. One is chosen at random. What is the probability it is red?
Answer:
- Total marbles: 12
- P(red) = 6/12 =
10.A bag has 4 red, 4 blue and 3 green marbles. One is chosen at random. What is the probability it is green?
Answer:
- Total marbles: 11
- P(green) = 3/11 =
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
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- Celebrate what went well first, then pick one thing to work on next.
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