This question uses the Auto data set in the ISLR package. Use mpg as the dependent variable and use horsepower as the independent variable. Use KNN regression and 10-fold cross validation with 2 repeats. Preprocess with center and scale, and set k to equal 43. What is the RMSE of the optimal model? Use set.seed(777).

Answers:	a. 9.27
	b. 7.94
	c. 8.19
	d. 6.15
	e. 4.24