# 80 bulbs are selected at random from a lot and their lifetime is recorded in the from of a frequency table given below:A bulb is chosen at random from the lot. What is the probability that the bulb chosen has lifetime less than 900 hours?A. B. C. D.

Total number bulbs= 80

Number of bulbs, which have lifetime of 300 hrs = 10

Number of bulbs, which have lifetime of 500 hrs = 15

Number of bulbs, which have lifetime of 700 hrs = 23

Number of bulbs, which have lifetime of 900 hrs = 25

Number of bulbs, which have lifetime of 1100 hrs = 7

Number of bulbs , having lifetime less than 900 hrs = 10 + 15 +23 = 48

Probability P() =

Probability of selecting a bulb which have a lifetime of 900 hrs

P(900) = = =

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Champ Quiz | Basics of Probability36 mins
RD Sharma | IMP Qs Discussion on Probability43 mins
Quiz | Calculating Probability39 mins
NCERT | Critical Thinking Problems in Probability39 mins
RD Sharma | Extras on Probability45 mins
Concept of Probability36 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