Caf$$ Michigan's manager, Gary Stark, suspects that demand for mocha latte coffees depends

on the price being charged. Based on historical observations, Gary has gathered the

following data, which show the numbers of these coffees sold over six different price values:

a$.$ Using these data, how many mocha latte coffees would be forecast to be sold according

to simple linear regression if the price per cup were $$2\mathrm{.}80?$

b$.$ What is the MAD?

c$.$ What is the Coefficient of Determination?

$,$ and what

does that tell you?