Here's how I'd analyze/state it.
It all revolves around the first 'if' statement. If I choose an answer
at random then I can't let any information from that answer influence my
result or it wont be random. Since there are 4 choices and now I can't
pay attention to what they are, then at random each has an equal
probability. A 25% B 25% C 25% D 25%. So given enough tries that's how
the results would distribute. But two of the answers are the same so I
have a 50% chance of choosing the answer represented by A or D which are
clearly now the wrong answer - they don't match. I have a 25% chance of
choosing B which also doesn't match and C doesn't match anything. So
the chance of being correct is 0%.
Robert C
On 10/29/11 8:27 AM, Victoria Hughes wrote:
------------------------------------------------------------------------
Best statistics question ever
<http://flowingdata.com/2011/10/28/best-statistics-question-ever/>
Posted: 28 Oct 2011 01:25 AM PDT
Best Math Question EVAR
<http://flowingdata.com/2011/10/28/best-statistics-question-ever/>
By way of Raymond Johnson
<https://plus.google.com/116264189418994838408/posts/CSXeyftovTJ>,
the best statistics multiple choice question ever written on a
chalkboard. Try not to think too hard. [via
<https://twitter.com/#%21/gnat/status/129654591200563201>]
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