On a tray there are 12 hard‑centred chocolates
What is the probability of selecting at least one soft-centred chocolate? (3 marks)
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♦ Mean mark 45%.
Probability, SMB-014
A game consists of two tokens being drawn at random from a barrel containing 20 tokens. There are 17 red tokens and 3 black tokens. The player keeps the two tokens drawn.
- Complete the probability tree by writing the missing probabilities in the boxes. (2 marks)
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- What is the probability that a player draws at least one red token? Give your answer in exact form. (2 marks)
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Probability, STD2 S2 2009 HSC 27c
In each of three raffles, 100 tickets are sold and one prize is awarded.
Mary buys two tickets in one raffle. Jane buys one ticket in each of the other two raffles.
Determine who has the better chance of winning at least one prize. Justify your response using probability calculations. (4 marks)
Probability, STD2 S2 2012 HSC 12 MC
Two unbiased dice, each with faces numbered 1, 2, 3, 4, 5, 6, are rolled.
What is the probability of a 6 appearing on at least one of the dice?