Select the correct answer.
Aweather historian gathered data about the average temperature and total snowfall in her city during the month of January in recent years. The scatter plot
shows the data she gathered and the line of best fit.
Inches of Snow
+19
+18
+17
+16
+15
+14
+13
+12
-11
January Weather
+
246 8 10 12 14 16 18 20 22 24 26 28 30 32
Average Temperature ("F))
The equation of the line of best fit is y=-0.368x+18.483
Based on the line of best fit, approximately how many inches of snow fall during the month of January when the average temperature is 2"F?
A17.7
B. 19.2
C. 23.9
D. 44.8

A best line of fit takes all the data points given and produces a linear equation that produces x and y values that are approximate to the data points.

A best line of fit won't always cross each data points, but it will at least be adjacent to them. Though, it's normal if there are outliers or points where the line is far away from.

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Solving the Problem

We're shown a graph with inches of snow on the y-axis and temperature on the x-axis.

Multiple data points (in red) and a line of best fit going through them. We're asked the predicted amount of snow that will fall at 2"F.

We look at the line at x = 2"F we can approximate the y-value to be between 17 and 18 inches, which leaves us with answer choice A.