Handling Data 7
2 marks · NormalA coin is biased so that the probability of getting a tail is 0.55.
Given that the coin has landed on a tail, what is the probability it will land on a tail again in the next flip? (The two flips are independent.)
Show answer
0.55 (±0.01)
Common mistakes: Multiplying 0.55 × 0.55
Show mark scheme and worked solution
Marking points
B1 · 2 marks · States correct probability: 0.55, as the flips are independent.
Worked solution
For independent events, the probability doesn't change based on previous results.
So the probability is also 0.55 for a tail on the second flip.