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1500 families with 2 children were sel...

1500 families with 2 children were selected randomly and the following data were recorded: No. of girls in a family 0 1 2 No. of families: 211 814 475 If a family is chosen at random, compute the probability that it has: (i) No girl (ii)  1 girl     (iii)  2 girls (iv) at most one girl    

Text Solution

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(i) Number of families having 2 girls =`475`Total families =`475+814+211=1500`
P(2 girls) = `(475)`/(total families)
`475/1500=19/60`
2)P(1girl)=`814/1500=407/750`
3)p(no girl)=`211/1500`
sum of all probabilities=`19/60+407/750+211/1500`
`1500/1500=1` ​
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