Question

At approximately what temperature do you think 80 glasses of lemonade will be sold?

Answer 1

approx. 98 degrees

Answer 2

draw a best fit line...

Answer 3

Here's what you do: bust out a ruler and draw a line that (ideally) has as many points on one side as on the other, and goes through some of them. That's called a "best-fit line." It's not always that neat and tidy -- sometimes your best fit line won't intersect any points, and sometimes your best fit line is a curve -- but it will show you how to predict the answer.