SOLUTION: I roll a fair six sided die 60 times, What is the probability that I will get: a) exactly 10 sixes? b) either 8 or 9 sixes? so I thought a) would be 60 nCr 10/ 6^60. Is that t

Algebra ->  Probability-and-statistics -> SOLUTION: I roll a fair six sided die 60 times, What is the probability that I will get: a) exactly 10 sixes? b) either 8 or 9 sixes? so I thought a) would be 60 nCr 10/ 6^60. Is that t      Log On


   

Question 418507: I roll a fair six sided die 60 times, What is the probability that I will get:
a) exactly 10 sixes?
b) either 8 or 9 sixes?
so I thought a) would be 60 nCr 10/ 6^60. Is that totally wrong? If so, what is the right answer?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
this is a binomial probability ___ you either get a six or not a six

P of 6 ___ 1/6 ___ call this S

P of not 6 ___ 5/6 ___ call this N

P of 10 sixes in 60 tries ___ 60C10 * (S^10) * (N^50)

use this technique to find the probability of 8 and the probability of 9