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

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

kropot72 · Answer

$$P(0\ girls)=\frac{211}{1500}$$
$$P(1\ girl)=\frac{814}{1500}$$
$$P(2\ girls)=\frac{475}{1500}$$
$$P(at\ most\ 1\ girl)=P(0\ girls)+P(1\ girl)$$
$$P(at\ least\ 1\ girl)=P(1\ girl)+P(2\ girls)$$

anonymous · Answer

what is the actually meaning of atmost

kropot72 · Answer

At most 1 girl means no more than 1 girl. Therefore 'at most 1 girl' includes families with no girls and families with 1 girl.

anonymous · Answer

thank u

kropot72 · Answer

You're welcome :)