Good question to generate discussion about both probability, and cognitive biases, in your maths class. From @DTWillingham's 'When Can You Trust the Experts'. Could give each Q to half of the class (without letting them know that I'd done so), let them fight it out, then discuss. 
Here's what the study found... Would be interesting to compare to your class' views. The study was: Tversky, A., & Kahneman, D. (1981). The framing of decisions and the psychology of choice. Science, 211, 453–458
And a bit more, helping us to make sense of the findings : )
