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?
29%
To read more about this, see the False Positive Paradox page on Wikipedia.
Which row is the odd one out?
A. K N Q T W Z B. B F J N R V C. A F K P V Z D. 3 6 9 12 15 18 E. 7 11 15 19 23 27 F. 13 18 23 28 33 38
C is the odd row out.
In A two letters are skipped between each letter.
C is the odd row out.
In A two letters are skipped between each letter.
What do you serve that a polite recipient would immediately send back?
A ball, when you’re playing tennis, volleyball, table tennis, etc.
A ball, when you’re playing tennis, volleyball, table tennis, etc.
Something wholly unreal, yet seems real to I
In your mind.
Some form a parliament,
What are we?
Birds. These are collective nouns for groups of birds.
Birds. These are collective nouns for groups of birds.
What word contains all 26 letters?
Alphabet (unfortunately there aren’t any actual dictionary words with every letter in the alphabet, so this gimmicky, somewhat unsatisfying answer has to suffice).
Alphabet (unfortunately there aren’t any actual dictionary words with every letter in the alphabet, so this gimmicky, somewhat unsatisfying answer has to suffice).
What work can one never finish?
An autobiography. Unless you’re writing it in your death bed I suppose, but even then, how will you be able to record the time of death?
An autobiography. Unless you’re writing it in your death bed I suppose, but even then, how will you be able to record the time of death?
What word starts with the letter “I”, becomes another word by adding the letter “A” yet has the same pronunciation?
Isle, Aisle
What do you fill with empty hands?
Gloves.
What 5-digit number satisfies the following requirements?
1. No zeroes
33264.
There are several ways of solving this. One way is to represent each spot with a letter, A – E.
Then you have these equations:
A = B
By simplifying, you get:
4 * A + 3 * C = 18
Plug in values for A and C to find that A = 3 C = 2.
33264.
There are several ways of solving this. One way is to represent each spot with a letter, A – E.
Then you have these equations:
A = B
By simplifying, you get:
4 * A + 3 * C = 18
Plug in values for A and C to find that A = 3 C = 2.