Question

let n be a radomly selected integer from 1 to 20. find the indicated probability (n is 2 given that it is even)

Answer 1

probability of what?

Answer 2

I think this is a conditional probability problem - that is P(A|B) with A = probability of a 2 given that the number is even

Answer 3

so intuitively, if the number is even, there are 10 even numbers between 1 and 20 inclusive

Answer 4

and one of those even numbers is 2

Answer 5

so the probability should be 1/10

Answer 6

that makes sense.

Answer 7

the definition of P(A|B) = P(A and B)/ P(B)