Basic ProbabilityEdexcel GCSE Maths: Flashcards
Card 1 of 120 of 12 known
Question
What is the range of the probability scale?
Tap or press Space to reveal
Tap card or press Space to flip
See all 12 cards
- What is the range of the probability scale?
- 0 (impossible) to 1 (certain).
- How do you calculate the probability of an event with equally likely outcomes?
- P(event) = favourable outcomes ÷ total possible outcomes.
- What is the probability of rolling a 6 on a fair die?
- 1/6.
- How do you calculate the expected number of successes in n trials?
- Expected number = probability × n.
- In 60 rolls of a fair die, how many 6s would you expect?
- (1/6) × 60 = 10.
- What is relative frequency?
- Number of times an event occurs ÷ total number of trials — an estimate of probability from an experiment.
- How does sample size affect relative frequency?
- Larger samples give relative frequencies that are closer to the true theoretical probability.
- What do the probabilities of an exhaustive set of outcomes add up to?
- If P(rain tomorrow) = 0.3, what is P(no rain tomorrow)?
- 1 − 0.3 = 0.7.
- What does 'mutually exclusive events' mean?
- Events that cannot both happen at the same time.
- What is a two-way table used for?
- Organising data or outcomes by two categories at once (rows and columns), to read off probabilities.
- A coin is flipped 100 times, landing heads 47 times. What is the relative frequency of heads?
- 47/100 = 0.47.