Wednesday 12 March 2014

PROBABILITY C1

The probability that it will rain tomorrow
is 5/11. Find the probability that it won’t rain.

Solution

Let P(E) =  5/11         P(E’) = ?

P(E)   + P(E’) = 1

5/11  + P(E’) = 1

P(E’) = 1 -  5/11  

P(E’) = 11/11 -  5/11  

P(E’) =  11-5
               11

P(E’) =  6
            11


Hence the probability that it won’t rain is 6/11.


TRY THIS..........

The probability that it will rain tomorrow
is 3/20. Find the probability that it won’t rain.



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