SOLUTION: A die is rolled 18 times with the amount of times that 2 comes up tallied. If this experiment is repeated many times, what is the mean and the standard deviation for the random var

Question 801862: A die is rolled 18 times with the amount of times that 2 comes up tallied. If this experiment is repeated many times, what is the mean and the standard deviation for the random variable X, the number of twos?
I know that n=18 and p=1/6.
P(X=2)
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A die is rolled 18 times with the amount of times that 2 comes up tallied. If this experiment is repeated many times, what is the mean and the standard deviation for the random variable X, the number of twos?
I know that n=18 and p=1/6.
P(X=2)
--------
mean = np = 18*(1/6) = 3
std = sqrt(npq) = sqrt(3(5/6)) = sqrt(5/2) =1.5811
-----------------
Cheers,
Stan H.
==============
RELATED QUESTIONS
A die is rolled 15 times and the number of twos that come up is tallied. If this... (answered by stanbon)

A die is rolled 20 times and the number of twos that comes up is tallied. Find the... (answered by stanbon)

A die is rolled 20 times and the number of twos that come up is tallied. Find the... (answered by Boreal)

A die is rolled 20 times and the number of twos that come up is tallied. Find the... (answered by rothauserc)

A die is rolled 100 times with the following results. Outcome-1 2 3 4 5 6... (answered by richard1234)

A die is rolled 9 times and the number of times that two shows on the upper face is... (answered by reviewermath)

A)a die is rolled 9 times and the number of times that two shows on the upper face is... (answered by stanbon)

a die is rolled 100 times. A 1 was rolled 14 times a 2 was rolled 20 times a 3 was rolled (answered by jim_thompson5910)

A single die is rolled five times, and the number of fours that come up is tallied. Find... (answered by sudhanshu_kmr)