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

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

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

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

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Transcript

Ex 15.1, 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 Ex 15.1, 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 Ex 15.1, 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 Ex 15.1, 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

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.