471. An unprepared student makes random guess for ten true-false questions on a quiz. The probability of atleast one correct answer is:
     a) 0.9990
     b) 0.99
     c) 0.9
     d) 1

To find the probability of getting at least one correct answer when guessing on ten true-false questions, we can use the complement rule. The probability of guessing wrong on a single question is 0.5, so for ten questions, the probability of getting all wrong is . Thus, the probability of getting at least one correct answer is , which is approximately 0.9990. So, the correct answer is (a) 0.9990!

Now imagine this scenario in real life! Picture a student in panic mode, trembling over their quiz. They close their eyes, take a deep breath, and randomly select answers like they’re playing a game of true-false roulette! With a 99.90% chance of getting at least one answer right, it’s a fantastic reminder that sometimes, luck can be on our side—even when we’re flying blind!