Probability distributions

Worked examples (9)

• 1The distribution for two fair coins
• 2A spinner with repeated sectors
• 3Finding a missing probability
• 4The total when two dice are thrown
• 5A different variable on the same sample space
• 6Solving for an unknown k
• 7A distribution from a selection without replacement
• 8The difference between two dice scores
• 9Judging whether a table can be a probability distribution

Model answers (9)

• ✓Model answer — 0479 Paper 1 style — 8.1
• ✓Model answer — 0479 Paper 2 style — 8.1
• ✓Model answer — 0479 Paper 1 style — 8.1
• ✓Model answer — 0479 Paper 2 style — 8.1
• ✓Model answer — 0479 Paper 2 style — 8.1
• ✓Model answer — 0479 Paper 1 style — 8.1
• ✓Model answer — 0479 specimen Paper 1 Q6 — 8.1 (links to 7.2, 7.3)
• ✓Model answer — 0479 Paper 2 style — 8.1
• ✓Model answer — 0479 Paper 1 style — 8.1 (AO2)

Worked examples (9)

• 1Expectation from a table
• 2Expectation with decimal probabilities, and what it means
• 3The expected number of occurrences in n trials
• 4Expectation from a tree diagram — the specimen question
• 5Expectation, occurrences and totals from one distribution
• 6Finding missing probabilities from a given expectation
• 7A fair game, and the organiser's expected profit
• 8Finding a missing value or prize from the expectation
• 9Expectation of a selection made without replacement

Model answers (9)

• ✓Model answer — 0479 Paper 1 style — 8.2
• ✓Model answer — 0479 Paper 2 style — 8.2 (AO2)
• ✓Model answer — 0479 Paper 1 style — 8.2
• ✓Model answer — 0479 specimen Paper 2 Q6(a) — 8.2 (links to 7.7)
• ✓Model answer — 0479 specimen Paper 2 Q6(b) — 8.2
• ✓Model answer — 0479 Paper 2 style — 8.2
• ✓Model answer — 0479 Paper 1 style — 8.2
• ✓Model answer — 0479 Paper 2 style — 8.2
• ✓Model answer — 0479 specimen Paper 1 Q6 style — 8.2