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Q&A #19029


Probability

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From: Ralph (for Teacher2Teacher Service)
Date: Nov 12, 2007 at 16:57:12
Subject: Re: Probability

Hi Chris,

Thanks for writing to T2T.  It's sometimes easier to "see" the probabilities
such as the examples you gave from a chart.  If you have students chart all
36 sums for the two dice, e.g.:

          1     2     3     4     5     6
-------------------------------------------------
   1      2     3     4     5     6     7

   2      3     4     5     6     7     8

   3      4     5     6     7     8     9

   4      5     6     7     8     9     10

   5      6     7     8     9     10    11

   6      7     8     9     10    11    12


They can then fairly quickly see how many of the sums, for example, are
greater than or equal to 6 (and write this as a fraction with 36 as the
denominator and simplify), how many sums are greater than 10, how many are
less than 10, etc.

Hope this helps,

 -Ralph, for the T2T service

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