Daily Math Puzzle: 2026-05-17
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2026-05-17
At an amusement park you have a single‑ride pass that lets you ride the first attraction that’s open, following this order: Ferris wheel → Roller coaster → Bumper cars. Each attraction is independently open with a 70% chance on any given day. What is the probability that you will end up riding the roller coaster?
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Solution
0.21 — You ride the roller coaster only if the Ferris wheel is closed *and* the roller coaster is open. The probability the Ferris wheel is closed is 1 − 0.7 = 0.3. The probability the roller coaster is open is 0.7. Since the two events are independent, multiply them: 0.3 × 0.7 = 0.21. Thus the chance of riding the roller coaster is 0.21, which corresponds to choice A.
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