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.

Question 22 (OR 1st question) - CBSE Class 10 Sample Paper for 2020 Bo

Question 22 (OR 1st question) - CBSE Class 10 Sample Paper for 2020 Boards - Maths Basic - Part 2

Note : This is similar to Ex 15.1, 17 of NCERT – Chapter 15 Class 10

Check the answer here https://www.teachoo.com/1981/563/Ex-15.1--17---A-lot-of-20-bulbs-contain-4-defective-ones/category/Ex-15.1/

 

Go Ad-free

Transcript

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 – 5 = 20 Now, P (getting a good bulb) = (π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ π‘”π‘œπ‘œπ‘‘ 𝑏𝑒𝑙𝑏𝑠)/(π‘‡π‘œπ‘‘π‘Žπ‘™ π‘›π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ 𝑏𝑒𝑙𝑏𝑠) = 20/25 = πŸ’/πŸ“

Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo