PDA

View Full Version : a tough little problem



engelbmj
May 22nd 2005, 09:35 AM
Anyone know how to solve this problem. The answer is 1554. Thanks.

Let X be a random variable representing the number of times you need to roll a dice (6 sided) until you get 4 consecutive 6's. Find E(X).

- Matt

krzysio
May 22nd 2005, 01:12 PM
You must not be counting the last roll. I am getting 1555. Take a look at:
http://www.math.ilstu.edu/krzysio/6-18-5-KO-Exercise.pdf
But if I am wrong and it is not 1555, when the last roll is included, I welcome
everyone's corrections.

Yours,
Krzys' Ostaszewski



Anyone know how to solve this problem. The answer is 1554. Thanks.

Let X be a random variable representing the number of times you need to roll a dice (6 sided) until you get 4 consecutive 6's. Find E(X).

- Matt

engelbmj
May 22nd 2005, 04:53 PM
Can anyone else access this link? I cannot. I get "page not found". If you figure it out, please share. Thanks.


You must not be counting the last roll. I am getting 1555. Take a look at:
http://www.math.ilstu.edu/krzysio/6-18-5-KO-Exercise.pdf
But if I am wrong and it is not 1555, when the last roll is included, I welcome
everyone's corrections.

Yours,
Krzys' Ostaszewski

Karen
May 22nd 2005, 05:33 PM
No, I cannot get the link to work either. I sent him a message to let him know.

I am not sure how you even started this problem. Can you show me your work?

Thanks,
Karen

krzysio
May 23rd 2005, 01:05 AM
There was a problem with the server, it should be up now, sorry. Please try again and let me know if it works.

Yours,
Krzys' Ostaszewski


Can anyone else access this link? I cannot. I get "page not found". If you figure it out, please share. Thanks.