Answer:
The answer is b. 25/216
Step-by-step explanation:
Bill wants to see how many times he needs to roll a standard number cube before getting a 5.
p = [tex]\frac{1}{6}[/tex] (on an average: roll 6 times before getting a 5)
The required probability can be found as :
[tex]\frac{1}{5}(\frac{5}{6}* \frac{5}{6}* \frac{5}{6})[/tex]
= [tex]\frac{5}{6}* \frac{5}{6}* \frac{1}{6}[/tex]
= [tex]\frac{25}{216}[/tex]
So, the answer is b. 25/216
