Question 2 - Questions - Basic Probability - Probability

Last updated at April 16, 2024 by

Ex 15.1, 2 - 1500 families with 2 children were selected - Ex 15.1

Ex 15.1, 2 - Chapter 15 Class 9 Probability - Part 2

Ex 15.1, 2 - Chapter 15 Class 9 Probability - Part 3

Ex 15.1, 2 - Chapter 15 Class 9 Probability - Part 4

Transcript

Question 2 1500 families with 2 children were selected randomly, and the following data were recorded: Compute the probability of a family, chosen at random, having 2 girls Total number of families = 475 + 814 + 211 = 1500 Number of families having 2 girls = 475 P (a randomly chosen family has 2 girls) = 475/1500 = 19/60 Question 2 Compute the probability of a family, chosen at random, having (ii) 1 girl Total number of families = 1500 Number of families having 1 girl = 814 P (a randomly chosen family has 1 girl) = 814/1500 = 407/750 Question 2 Compute the probability of a family, chosen at random, having (iii) No girl Total number of families = 1500 Number of families having no girl = 211 P (a randomly chosen family has no girl) = 211/1500 Question 2 Also check whether the sum of these probabilities is 1. Sum of all these probabilities = 19/60 + 407/750 + 211/1500 = 475/1500 + 814/1500 + 211/1500 = 1500/1500 = 1 Hence, sum of probabilities is 1

Ask a doubt
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, Social Science, Physics, Chemistry, Computer Science at Teachoo.