Asked by Roger
The numbers 1 to 15 are placed in a hat, and a number is selected. What is the probability that the number is 4 given it is known to be an even number?
Answers
Answered by
Reiny
sounds like conditional probabilty
Prog(A|B) , (read as the prob of A, given B)
= prob(A AND B)/prob(B)
prob(A and B) = 1/15
prob(B) = 7/15
prob( as stated) = (1/15) / (7/15)
= 1/7
(of course, since the 4 is one of the 7 even numbers from 1 - 15)
Prog(A|B) , (read as the prob of A, given B)
= prob(A AND B)/prob(B)
prob(A and B) = 1/15
prob(B) = 7/15
prob( as stated) = (1/15) / (7/15)
= 1/7
(of course, since the 4 is one of the 7 even numbers from 1 - 15)
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