Q. 155.0( 2 Votes )

A die is thrown thrice. A success is 1 or 6 in a throw. Find the mean and variance of the number of successes.

Answer :

Let p be the probability of success


the p = probability of getting 1 or 6




Given, n = 3


Mean = np



= 1


Variance = npq




= 0.66


Therefore, mean = 1, standard deviation = 0.66.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses
RELATED QUESTIONS :