An aerobic exercise instructor remembers the data given in the following table, which shows the recommended maximum exercise heart rates for individuals of the given ages. (A graphing calculator is recommended.) Age (x years) 20 40 60 Maximum heart rate (y beats per minute) 173 157 141 (c) Find the equation of the least-squares regression line. (Round your answers to two decimal places.) ŷ =
(d) Use the equation of the least-squares line from part (c) to predict the maximum exercise heart rate for a person who is 72. (Round your answer to the nearest whole number.)