Interpreting Probability Statements How would you interpret the following line:

"What is the probability that a 90s song from Sam's iPod is not a pop song"

Would you choose either, 
$a)$ "The probability of being not a pop song given it's from the 90s"
$b)$ "The probability of being not a pop song and from the 90s"
I can't make a distinction between the two. Which one, in your opinion is correct, and why?

I would go with (a). The wording seems to imply that we are given that the song will be from the 90s. In other words, the sample space is the set of 90s songs on Sam's iPod. 
