If the chances of rain are 40% and 20% for the two days of the weekend, what is the chance that it will rain on at least one of the two days?
2 Answers
The Reqd. Prob.
Explanation:
Let
Therefore, by what is given, we have,
The Reqd. Prob.
As regards,
Therefore,
The Reqd. Prob.
We first look at the chance of it NOT raining at both days.
Explanation:
Saturday: 60% of NO rain, translates to a fraction of
Sunday: 80% of NO rain, a fraction of
Both Sat AND Sun No rain means MULTIPLY :
So the chance of rain on at least one of the days will be:
Extra:
Of this
Summary:
- No rain at all: 48%
- Rain one day: 44%
- Rain both days: 8%
Adding up to 100% (this is to check your answer)