SOLUTION: A pair of dice is rolled 20 times and the sum is recorded. Find the probability of rolling at least 2 double sixes.

Algebra.Com
Question 981931: A pair of dice is rolled 20 times and the sum is recorded. Find the probability of rolling at least 2 double sixes.
Answer by Edwin McCravy(20056)   (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 binomcdf(, press ENTER

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

Press ENTER

binomcdf(20,1/36,1)

Press ENTER

See .8945518471

That's the probability of getting either no double 6's or just
1 double 6.  So we must subtract that from 1. So 

Press 1, -, 2ND (-)  

See 1-Ans

Press ENTER

.1054481529

Edwin
RELATED QUESTIONS

A pair of dice is rolled 20 times and the sum is recorded. Find the probability of... (answered by Edwin McCravy)
A pair if dice is rolled four times. Find the probability of rolling an even total... (answered by Theo)
A pair of dice are rolled 20 times. What is the probability that: A sum of seven is... (answered by Edwin McCravy)
a pair of dice is rolled and the sum of the dice is found. what is the probability of... (answered by swincher4391)
A pair of fair dice is rolled. What is the probability of rolling a sum that is even or... (answered by CharlesG2)
What is the probability of obtaining a sum of at least 6 when rolling a pair of dice? (answered by stanbon)
What is the probability of obtaining a sum of at least eight when rolling a pair of... (answered by Edwin McCravy)
a pair of dice is rolled. What are the odds against rolling the sum of... (answered by stanbon)
A pair of dice is rolled. What are the odds against rolling a sum of... (answered by josmiceli)