Q. 9

A lot of 20 bulbs contain 4 defective ones. One bulb is selected at random from the lot. What is the probability that this bulb is defective? Suppose the bulb selected in previous case is not defective and is not replaced. Now one bulb is selected at random from the rest. What is the probability that this bulb is not defective?

Answer :

Given,

Total number of bulbs = 20


Defective bulbs = 4


Probability selected this bulb is defective –


P(selected bulb is defective) =


P(selected bulb is defective) =


P(selected bulb is defective) =


Probability the selected bulb is defective is


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Quiz | Imp. Qs. of Probability37 mins
Let's understand Probability40 mins
When Chance is called Probability48 mins
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