SOLUTION: Here is one that is really puzzling me. A die is rolled 360 times. Find the standard deviation for the number of 3's that will be rolled. I am not even sure where to begin wi

Algebra ->  Probability-and-statistics -> SOLUTION: Here is one that is really puzzling me. A die is rolled 360 times. Find the standard deviation for the number of 3's that will be rolled. I am not even sure where to begin wi      Log On


   



Question 133851: Here is one that is really puzzling me.
A die is rolled 360 times. Find the standard deviation for the number of 3's that will be rolled.
I am not even sure where to begin with that.

Answer by nanaktutors@yahoo.com(8) About Me  (Show Source):
You can put this solution on YOUR website!
Ans. X = no of 3’s out of 360 times a die is rolled
X follows Binomial(n , p)
Where n=360 p=1/6
SD =sqrt[np(1-p)] = 7.07