3. 1500 families with 2 children were selected randomly,
the following data were recorded :
No.of Girls in family 2 1 0
No. of families
475 814 211
Compute the probability of a family chosen at random
having
1) 2 Girls
2) I Girl
3) No girl
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Answer:
(i) 2 girls
Total number of families = 475 + 814 +2111500
Number of families having 2 girls = 475
P (a randomly chosen family has 2 girls)
Number of families having 2 girls
__________________________
Total number of families
=475/1500
=19/ 60
(ii) 1 girl
Total number of families = 1500
Number of families having 1 girl = 814
P (a randomly chosen family has 1 girl)
Number of families having 1 girl
_________________________
Total number of families
=814/1500
=407/750
(iii) No girl
Total number of families = 1500 Number of families having no girl = 211
P(a randomly chosen family has no girl)
Number of families having no girl
_____________________________
Total number of families
=211/1500
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