Question

Hannah has a biased coin.
She is going to throw the coin once.
The probability of getting heads is 0.7
Work out the probability of getting tails

Answer 1

There is a 90% chance of getting tails 

Answer 2

The probability of getting heads is 0.7 which equals 70%. 100% - 70% is 30%. Meaning there is only 30% left. Which means the probability of getting tails is 30%.