SOLUTION: A pair of dice is rolled 20 times and the sum is recorded. Find the probability of double sixes occurring exactly two times.

Question 981930: A pair of dice is rolled 20 times and the sum is recorded. Find the probability of double sixes occurring exactly two times.

Answer by Edwin McCravy(20060) (Show Source): You can put this solution on YOUR website!

There are 36 possible rolls and only one is a double 6, so the
probability of one double 6 in 1 roll is 1/36.

on your TI-84 

press 2ND VARS

Scroll down to binompdf(, press ENTER

Don't get binompdf( and binomcdf mixed up, the "c" is for
"cumulative" and the "p" is for "particular value".  This is
a particular number of times, 2.

         trials:20
         p:1/36
         x value:2
         Paste 

Press ENTER

binompdf(20,1/36,2)

Press ENTER

.0882934291


Edwin

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