Question 22 (OR 1st question) A lot of 25 bulbs contain 5 defective ones. One bulb is drawn at random from the lot. What is the probability that the bulb is good.
Given
Total number of bulbs = 25
Total number of defective bulbs = 5
So,
Total Number of good bulbs = 25 β 5 = 20
Now,
P (getting a good bulb) = (ππ’ππππ ππ ππππ ππ’πππ )/(πππ‘ππ ππ’ππππ ππ ππ’πππ )
= 20/25
= π/π

Made by

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.