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Die Toss (Posted on 2003-07-24) Difficulty: 2 of 5
A die is tossed until the sum of the rolls is 15 or greater.

What is the most likely total? What is the the least likely total which can occur?

  Submitted by Brian Smith    
Rating: 4.3750 (8 votes)
Solution: (Hide)
The values which can occur are 15, 16, 17, 18, 19 and 20.

15 can be made 6 ways : 1+14, 2+13, 3+12, 4+11, 5+10, 6+9. 16 can be made 5 ways : 2+14, 3+13, 4+12, 5+11, 6+10. 17 can be made 4 ways : 3+14, 4+13, 5+12, 6+11. 18 can be made 3 ways : 4+14, 5+13, 6+12. 19 can be made 2 ways : 5+14, 6+13. 20 can be made 1 way : 6+14.

The most likely total is 15. The least likely total is 20.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Some ThoughtsQuick but not so dirty probabilitiesSteve Herman2015-02-02 21:26:38
AnswerK Sengupta2008-10-07 00:06:59
re: Solution to half the problemsean2005-08-24 02:37:56
SolutionFull solution to the problemdraistal2004-01-20 11:58:08
re: Solution to half the problemnellie2003-07-27 07:00:21
Solution to half the problemSohini2003-07-26 07:54:26
SolutionThe probabilitiesCharlie2003-07-24 12:45:59
re: SolutionLewis2003-07-24 09:17:08
SolutionSolutionLewis2003-07-24 09:15:11
Some Thoughtsre: A startLewis2003-07-24 09:07:59
A startnellie2003-07-24 09:03:20
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