The faces of an 8-sided die are numbered from 1 to 8. What is the probability of rolling a 5 three times in ten rolls?
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OpenStudy (anonymous):
what's the probability of rolling a 5 once?
OpenStudy (anonymous):
5/6
OpenStudy (anonymous):
how do you get 5/6
OpenStudy (anonymous):
Do you want to learn how to do this or do you just want the answer?
OpenStudy (anonymous):
as you like show me the steps
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OpenStudy (anonymous):
what's the probability of rolling a 6 if you're rolling one time?
OpenStudy (anonymous):
1
OpenStudy (anonymous):
you're saying if you roll a die, you have a 100% chance of getting a 6? have you ever tried rolling a die? :-)
OpenStudy (anonymous):
yeah
OpenStudy (anonymous):
i'll give you a hint - the probability of getting any result on a die is the same. If I ask you the probability of getting a 2, or a probability of getting a 6, your answer should be the same
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OpenStudy (anonymous):
well anyway the answer is 12353145/134217728
OpenStudy (anonymous):
the total answer
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
thnx but i need the steps i know the final answer 0.09
OpenStudy (anonymous):
okay what's the probability of getting a 5 once
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OpenStudy (anonymous):
1/6
OpenStudy (anonymous):
that's for a 6 sided die but your problem uses a special die
OpenStudy (anonymous):
1/8
OpenStudy (anonymous):
okay now just plug that into the PDF of the binomial distribution with p=1/8 , n=10 and i=3 and you get .0920381