1500 families with 2 children were selected randomly, and the following data were recorded: No. of girls in a family 2 1 0 No. of families 475 814 211
computer probability of family chosen at random having:
a)At least 2 girls
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1500 families with 2 children were selected randomly, and the following data were recorded: No. of girls in a family 2 1 0 No. of families 475 814 211
computer probability of family chosen at random having:
a)At least 2 girls
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Verified answer
(i) Number of families having 2 girls =475
(i) Number of families having 2 girls =475Total families =475+814+211=1500
(i) Number of families having 2 girls =475Total families =475+814+211=1500 P(2 girls) =Total families/475
475=1500/475=60/19
19(ii) P(1 girl)=1500/814=750/407
407(iii) P(No girl) =1500/211
211Sum of all these probabilities
211Sum of all these probabilities =6019+750407+1500/211
211=1500/475+814+211
475+814+211=1500/1500=1
1500=1Sum of these probabilities =1