## Elementary Statistics (12th Edition)

We know that the proportions are as follows: Proportion of girls, probability 0, 1/8 1/3, 3/8 2/3, 3/8 1, 1/8 We know the sample proportion is $1/2$. Hence, using the table above, we find that the population proportion is: $1/3(3/8)+2/3(3/8)+1/1(1/8)=0.5$ We see that the sample proportion is an unbiased predictor of the population proportion, because the sample and population proportions are the same.