The five questions everyone played that day, in the order they were asked, with the correct answers and why they are right.
Which vitamin does your skin make when exposed to sunlight?
Ultraviolet light lets the skin produce vitamin D, which the body needs to absorb calcium for healthy bones. That's why deficiency is more common in winter at high latitudes.
90% of players got this rightSource: en.wikipedia.org
Climbing from floor 1 to floor 3 takes 40 seconds. At the same pace, how long from floor 1 to floor 7?
Floor 1 to 3 is only 2 flights, so each flight takes 20 seconds. Floor 1 to 7 is 6 flights: 120 seconds. Count the gaps between floors, not the floors themselves.
16% of players got this right
You flip 10 fair coins. Which is more likely?
Exactly 5 heads is the single most likely count, but it still happens only about 25% of the time (252 of 1,024 outcomes).
68% of players got this right
A snail at the bottom of a 10 m well climbs 3 m each day and slips back 2 m each night. On which day does it reach the top?
It gains 1 m a day, so it starts day 8 at 7 m — and climbs the last 3 m before it can slip back.
45% of players got this right
You roll three fair dice. What is the chance all three show the same number?
Whatever the first die shows, the other two must each match it: 1/6 × 1/6 = 1/36. The first die can be anything, so it doesn't reduce the chance.
32% of players got this right
