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Maths (Foundation)
Conditional probability

Starter quiz

  • In which of these situations is it not possible to work out a theoretical probability?
    • Predicting the winner in a game of tennis  ✓
    • Predicting which way up a toy brick lands  ✓
    • Predicting the outcome of flipping a fair coin
    • Predicting the winner in a race  ✓
    • Predicting the outcome of spinning a fair spinner
  • Izzy rolls a die 4 times. The dice lands on a '6' three times. Which of these statements are correct?
    • The die could be fair but more trials are needed to be sure.  ✓
    • The die is definitely fair.
    • The die is definitely biased towards a 6.
    • The die is definitely not biased towards a 6.
    • The die could be biased but more trials are needed to be sure.  ✓
  • A spinner contains three letters: A, B and C. The tables show results from four experiments with the spinner. Which experiment will produce the most reliable set of experimental probabilities?
    A spinner contains three letters: A, B and C. The tables show results from four experiments with the spinner. Which experiment will produce the most reliable set of experimental probabilities?
    • Experiment 1
    • Experiment 2
    • Experiment 3  ✓
    • Experiment 4
  • The table shows the theoretical probabilities of taking a counter of a specific colour out of a bag of counters. In 1000 trials, the number of times you should expect to draw a green counter is <span class="blank">______</span>.
    The table shows the theoretical probabilities of taking a counter of a specific colour out of a bag of counters. In 1000 trials, the number of times you should expect to draw a green counter is ______.
    • '150' ✓
  • A box contains 100 counters. A counter is drawn, its colour noted and replaced. The results are in the table. Estimate how many green counters are in the box.
    A box contains 100 counters. A counter is drawn, its colour noted and replaced. The results are in the table. Estimate how many green counters are in the box.
    • 17
    • 34  ✓
    • 51
    • 68
    • 126
  • A class investigates whether a 6-sided die is biased. The table shows the results. Estimate the probability of the die landing on a factor of 6. P(factor of 6) = <span class="blank">______</span> (as an unrounded decimal).
    A class investigates whether a 6-sided die is biased. The table shows the results. Estimate the probability of the die landing on a factor of 6. P(factor of 6) = ______ (as an unrounded decimal).
    • '0.6665' ✓
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