Question

1500 families with 2 children were selected randomly and the following data was recorded :

no of girls : 0 , 1 , 2

no. of families : 211 , 814 , 475

if a family is chosen at random , find the probability that it has

a) at most one girl

b) at least one girl

please explain it ?

Answer 1

a) totol no of children's are 3000
no of favorable outcome = no of families in which the no of girls is 0 or 1
=211+814
= 1025
now
probability= 1025/3000
= 41/120


b)total no. is 3000
no of favorable outcome = no of families in which no of girls is 1 or 2
=814+475
= 1289

now
probability= 1289/3000

Answer 2

The answer is in the attachment.