41 Gender in two-child families. Refer to the Human Biology

(Feb. 2009) study on the gender of children in two-child families, Exercise 25. Recall that the National Health Interview Survey (NHIS) of almost 43,000 two-child families yielded the following table. You used this information in Exercise 25d to find the probability distribution for x , the number of boys in a two-child family. Find E ( x ) and give a practical interpretation of its value.

Transcribed Image Text:

Gender Configuration Proportion Girl-girl (GG) .222 Boy-girl (BG) .259 Girl-boy (GB) Boy-boy (BB) .254 .265