Heights (in centimeters) and weights (in kilograms) of 7 supermodels are given below. Find the regression equation, letting the first variable be the independent (z) variable, and predict the weight of a supermodel who is 171 cm tall. Height 172 176 178 176 178 166 174 Weight 53 56 58 54 57 47 55 The regression equation is = + x. The best predicted weight of a supermodel who is 171 cm tall is