Imagine an HIV test that is 95% accurate (false positive rate of 5%) and around 2% of the tested population is infected with HIV. What is the probability that you actually have HIV when your test comes back positive?
I was standing by a railing,
watching a ship a sailing.
What is the Captain’s name.
If you don’t know his name,
It’s you to blame.
What is the Captain’s name.
Thanks to Sherry for submitting this one. Here’s the backstory of the riddle.
“One of my favorites I remember as a child from my father, he always said it was a Newfoundland riddle. I don’t know where it may have originated. This is usually spoken. Ensure you say it as a statement and not a question.”
A comb. Other inanimate objects with teeth like a saw, zipper or a gear can “bite” you. Many people can affirm from painful experience in regards to zippers and saws, and the unfortunate factory worker who is missing a finger can attest to gears. It’s a rare event that anyone would be injured by a comb.
A sharpshooter hangs up his hat, turns around and walks 5000 meters in one direction, then turns around and shoots his gun, putting a hole right through his hat. How did he do it?