Mathematics for IGCSE & O level - Probability (Section 5 - No. 45)
A weather forecaster says there is a 70% chance of rain. What are the odds of it *not* raining (in fractional form)?
7/10
3/10
7/3
3/7
解释
If the chance of rain is 70%, the chance of no rain is 30%, which is 30/100 = 3/10.