The mean height of American women in their early twenties is about $64.5$ inches, with a standard deviation of about $2.7$ inches.
If the correlation between the heights of married men and their wives is about $r = 0.5$, what is the equation of the regression line of the husband's height on the wife's height in young couples?
Predict the height of the husband of a married woman who is $67$ inches tall.
I have tried on my own through reading and research to solve this problem but have been unable to come up with a solution because I do not know the standard deviation of the height of married men among these young couples nor their mean height. I need both to calculate the slope of the least-squares regression line and the $y$-intercept. Further, I have no dataset from which to calculate the mean or standard deviation of the height of young married men. Please help.