Might we be able to predict life expectancyes from birthrates? Below are bivariate data giving birthrate and life expectancy information for each of twelve countries. For each of the countries, both x, the number of births per one thousand people in the population, and y, the female life expectancy (in years), are given. Also shown are the scatter plot for the data and the least-squares regression line. The equation for this line is y =81.85 - 0.45x. Birthrate, x ( number of births per 1000 Female life expectancy, y (in years) people) 13.1 75.2 8 28.0 72.0 31.1 62.5 50.2 54.5 + + 49.6 62.3 (in years) Female life expectancy X 14.8 74.1 20.5 72.1 46.4 60.1 8 37.3 67.1 10 15 20 25 30 35 40 45 50 55 60 40.2 65.1 Birthrate 51.1 59.4 (number of births per 1000 people) 26.0 73.4 Send data to calculator > Based on the sample data and the regression line, complete the following. X (a) For these data, female life expectancyes that are less than the mean of the female life expectancies tend to be paired with birthrates that are (Choose one) v the mean of the birthrates. (b) According to the regression equation, for an increase of one (birth per 1000 people) in birthrate, there is a corresponding decrease of how many years in female life expectancy