The five questions everyone played that day, in the order they were asked, with the correct answers and why they are right.
A film starts at 7:40 pm and lasts 1 hour 50 minutes. When does it end?
Add 2 hours to get 9:40 pm, then take back the extra 10 minutes: 9:30 pm. Rounding to a whole hour and correcting is quicker than adding minutes across the hour.
86% of players got this right
Pens cost $3 for 2. How much do 10 pens cost?
10 pens is 5 lots of 2, and 5 × $3 = $15. Scaling a known group is usually faster than working out the price of one.
91% of players got this right
Roughly how many times has a person's heart beaten by their 30th birthday?
About 70 beats a minute × 60 × 24 × 365 × 30 ≈ 1.1 billion.
25% of players got this rightSource: en.wikipedia.org
You flip a fair coin twice. What is the chance of at least one head?
Only tails–tails has no head, and that's 1 of 4 equally likely outcomes, so at least one head is 3/4. For “at least one”, it's usually easiest to subtract the “none” case from 1.
11% of players got this right
Rank these chances from the best bet to the worst.
Correct order
7 in 8 (87.5%), then 4 in 6 (67%), then 1 in 4 (25%), then 12 in 52 (about 23%) — the last two are close.
9% of players got this right
