Showing posts with label Expected value. Show all posts
Showing posts with label Expected value. Show all posts

Sunday, February 20, 2011

Fox 329

E[R] below can be computed depending on the random process... Try to guess what it is before computing. Randomness may be a fancy business...
See a similar concept: Bertrand Paradox


Dervish Fox: How can you cut a square randomly?

Red Fox:
Here is a way; first generate a random number to represent point A. Then another random number for point B along the three others sides. Drawn the line AB, and cut it out.

Dervish:
And how can you generate a random number?

Red:
Excel does it easily. Type "=RAND()", and boom, you get one right away.

Dervish:
But that depends on some seed numbers in the machine's memory, no?

Red:
Yes, that's why they call them pseudo-random numbers. Do you have a problem with that?

Dervish:
I have a bigger problem than that.

Red:
So... you believe that random numbers can't exist.

Dervish:
I believe that the word "random" should be removed from all world dictionaries.

Red:
Radical.

http://www.8foxes.com/

Monday, January 3, 2011

Fox 324

Before starting to publish received solutions for earlier foxes, let's start with a new one. Here, "random selection" means that points P and Q are uniformly distributed along 2 parallel sides.
Ahh, yes, expected value of the "ratio of" the bigger area to the smaller one is asked - obviously. Let's give some leeway to minor mistakes in our life. "Perfect" may sometimes be boring!

Wednesday, February 3, 2010

Fox 240

Now this asks little more than geometry.
Note that the random process described in the question is discrete.
Ladybugs "appear" in next vertices at the same time.

Tuesday, December 22, 2009

Fox 217

Have beautiful days with your families
and the loved ones!
See you guys next year!
Yourself should show mercy on yourself.
Break your daily routine,
Do something out of the box.
While enjoying the time...
NEVER QUIT THINKIN' !